Remove fixed search paths from autotools.

--- a/m4/package_utilies.m4	1970-01-01 01:00:01.000000000 +0100
+++ b/m4/package_utilies.m4	2020-07-07 12:41:48.871661042 +0200
@@ -23,32 +23,32 @@
     AC_PACKAGE_NEED_UTILITY($1, "$cc", cc, [C compiler])
 
     if test -z "$MAKE"; then
-        AC_PATH_PROG(MAKE, gmake,, /usr/bin:/usr/freeware/bin)
+        AC_PATH_PROG(MAKE, gmake)
     fi
     if test -z "$MAKE"; then
-        AC_PATH_PROG(MAKE, make,, /usr/bin)
+        AC_PATH_PROG(MAKE, make)
     fi
     make=$MAKE
     AC_SUBST(make)
     AC_PACKAGE_NEED_UTILITY($1, "$make", make, [GNU make])
 
     if test -z "$LIBTOOL"; then
-	AC_PATH_PROG(LIBTOOL, glibtool,, /usr/bin)
+	AC_PATH_PROG(LIBTOOL, glibtool)
     fi
     if test -z "$LIBTOOL"; then
-	AC_PATH_PROG(LIBTOOL, libtool,, /usr/bin:/usr/local/bin:/usr/freeware/bin)
+	AC_PATH_PROG(LIBTOOL, libtool)
     fi
     libtool=$LIBTOOL
     AC_SUBST(libtool)
     AC_PACKAGE_NEED_UTILITY($1, "$libtool", libtool, [GNU libtool])
 
     if test -z "$TAR"; then
-        AC_PATH_PROG(TAR, tar,, /usr/freeware/bin:/bin:/usr/local/bin:/usr/bin)
+        AC_PATH_PROG(TAR, tar)
     fi
     tar=$TAR
     AC_SUBST(tar)
     if test -z "$ZIP"; then
-        AC_PATH_PROG(ZIP, gzip,, /bin:/usr/local/bin:/usr/freeware/bin)
+        AC_PATH_PROG(ZIP, gzip)
     fi
 
     zip=$ZIP
@@ -61,25 +61,25 @@
     AC_SUBST(makedepend)
 
     if test -z "$AWK"; then
-        AC_PATH_PROG(AWK, awk,, /bin:/usr/bin)
+        AC_PATH_PROG(AWK, awk)
     fi
     awk=$AWK
     AC_SUBST(awk)
 
     if test -z "$SED"; then
-        AC_PATH_PROG(SED, sed,, /bin:/usr/bin)
+        AC_PATH_PROG(SED, sed)
     fi
     sed=$SED
     AC_SUBST(sed)
 
     if test -z "$ECHO"; then
-        AC_PATH_PROG(ECHO, echo,, /bin:/usr/bin)
+        AC_PATH_PROG(ECHO, echo)
     fi
     echo=$ECHO
     AC_SUBST(echo)
 
     if test -z "$SORT"; then
-        AC_PATH_PROG(SORT, sort,, /bin:/usr/bin)
+        AC_PATH_PROG(SORT, sort)
     fi
     sort=$SORT
     AC_SUBST(sort)
path'>path: <a href='/guix/log/?id=fb2347f6d161db0c0ec5fd8fd952ab8cdb7c2738'>root</a>/<a href='/guix/log/gnu?id=fb2347f6d161db0c0ec5fd8fd952ab8cdb7c2738'>gnu</a>/<a href='/guix/log/gnu/packages?id=fb2347f6d161db0c0ec5fd8fd952ab8cdb7c2738'>packages</a>/<a href='/guix/log/gnu/packages/xorg.scm?id=fb2347f6d161db0c0ec5fd8fd952ab8cdb7c2738'>xorg.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/xorg.scm?id=fb2347f6d161db0c0ec5fd8fd952ab8cdb7c2738&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-08-11 10:47:52 +0100'>2024-08-11</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=8b943673a15a337c48c71cecad18d9eb68143d95'>gnu: xpra: Update to 6.1.0.</a><span class='msg-avail'>...</span></td><td>Andy Tai</td></tr>
<tr><td><span title='2024-07-09 23:25:27 -0500'>2024-07-09</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=71694363f6cc79e44955acbd9f7ca108e658caca'>gnu: xpra: Update to 6.0.2.</a><span class='msg-avail'>...</span></td><td>Andy Tai</td></tr>
<tr><td><span title='2024-05-26 09:51:11 +0100'>2024-05-26</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=13d5e6f84a5a3130b628bc37377db562fc69b057'>gnu: xpra: Update to 6.0.1.</a><span class='msg-avail'>...</span></td><td>Andy Tai</td></tr>
<tr><td><span title='2024-05-14 12:05:25 +0100'>2024-05-14</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=61140300c20609f540029e30b72b7bf466f259cd'>gnu: xpra: Update to 6.0.</a><span class='msg-avail'>...</span></td><td>Andy Tai</td></tr>
<tr><td><span title='2024-04-15 10:11:43 +0100'>2024-04-15</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=83a2ff488ded9757ea34cdb04a41ad5867305c0d'>gnu: xpra: Update to 5.0.8.</a><span class='msg-avail'>...</span></td><td>Andy Tai</td></tr>
<tr><td><span title='2024-04-03 17:42:59 -0400'>2024-04-03</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=9b560fee239a7fd563e05ca9926b178f15954833'>gnu: xorg-server: Update to 21.1.12 [security fixes].</a><span class='msg-avail'>...</span></td><td>John Kehayias</td></tr>
<tr><td><span title='2024-04-03 15:54:03 -0400'>2024-04-03</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=e8dba8afffeb5cfc832b4898afbe1df2470450bf'>gnu: xorg-server-xwayland: Update to 23.2.5 [security fixes].</a><span class='msg-avail'>...</span></td><td>John Kehayias</td></tr>
<tr><td><span title='2024-03-30 10:02:52 +0100'>2024-03-30</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=72ca1a336ab296187a4d025c399fade63004c780'>Merge branch 'emacs-team'</a></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2024-03-27 05:22:31 +0100'>2024-03-27</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=4c70f5242befb5786cb437559a4d8701e630bd29'>Merge branch 'master' into emacs-team</a></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2024-03-26 08:23:07 +0200'>2024-03-26</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=7dfb3155fc4dd37bea93a8704c37e4aff87e5013'>gnu: xterm: Update to 390.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2024-03-10 09:39:39 +0800'>2024-03-10</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=7f1cd8847fb3c7a1c75df0a06e1fa4d298a66cbb'>gnu: xpra: Update to 5.0.7.</a><span class='msg-avail'>...</span></td><td>Andy Tai</td></tr>
<tr><td><span title='2024-03-02 08:07:11 +0100'>2024-03-02</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=3d4fc910f73220f47e5f2459853333a7c83c5d1d'>Merge branch 'master' into emacs-team</a></td><td>Liliana Marie Prikler</td></tr>
<tr><td><span title='2024-02-05 14:13:22 +0800'>2024-02-05</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=049ca6d4765c26d7d7822ea5ac0ca27351351578'>gnu: Add egl-gbm.</a><span class='msg-avail'>...</span></td><td>Hilton Chain</td></tr>
<tr><td><span title='2024-02-05 14:13:04 +0800'>2024-02-05</span></td><td><a href='/guix/commit/gnu/packages/xorg.scm?id=082cb392194e36e96fec1795e3c494c1992371e7'>gnu: egl-wayland: Update to 1.1.13.</a><span class='msg-avail'>...</span></td><td>Hilton Chain</td></tr>