This patch removes compilation flags which make the build for the machine
where compilation takes place, rendering the build not reproducible.

diff --git a/configure b/configure
index 8b6aaef..49a6afc 100755
--- a/configure
+++ b/configure
@@ -6125,14 +6125,6 @@ fi # guess arch
 
 if test "x$ax_gcc_arch" != x -a "x$ax_gcc_arch" != xno; then
 for arch in $ax_gcc_arch; do
-  if test "x$acx_maxopt_portable" = xyes; then # if we require portable code
-    flags="-mtune=$arch"
-    # -mcpu=$arch and m$arch generate nonportable code on every arch except
-    # x86.  And some other arches (e.g. Alpha) don't accept -mtune.  Grrr.
-    case $host_cpu in i*86|x86_64*) flags="$flags -mcpu=$arch -m$arch";; esac
-  else
-    flags="-march=$arch -mcpu=$arch -m$arch"
-  fi
   for flag in $flags; do
     as_CACHEVAR=`$as_echo "ax_cv_check_cflags__$flag" | $as_tr_sh`
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether C compiler accepts $flag" >&5
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<tr><td><span title='2017-03-30 01:30:16 +0200'>2017-03-30</span></td><td><a href='/guix/commit/gnu/packages/marst.scm?id=6fd52309b8f52c9bb59fccffac53e029ce94b698'>gnu: Use HTTPS for almost all gnu.org HOME-PAGEs.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2016-07-29 10:13:12 +0200'>2016-07-29</span></td><td><a href='/guix/commit/gnu/packages/marst.scm?id=a3947cb1b8c471a04abb785b830da661b197aaae'>gnu: Sync GNU descriptions with upstream.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>