Don't escape forward slashes to prevent a warning from grep 3.8.

diff --git a/tests/link-order.at b/tests/link-order.at
--- a/tests/link-order.at
+++ b/tests/link-order.at
@@ -99,12 +99,12 @@ aix* | interix*) ;;  # These systems have different path syntax
   case $hardcode_direct$hardcode_direct_absolute in
   yesno)
     AT_CHECK([if $EGREP relinking stderr; then
-         $EGREP " .*\/new\/lib/libb$shared_ext .*\/old\/lib/libcee$shared_ext" stdout
+         $EGREP " .*/new/lib/libb$shared_ext .*/old/lib/libcee$shared_ext" stdout
        else :; fi], [0], [ignore], [], [echo "wrong link order"])
     ;;
   *)
     AT_CHECK([if $EGREP relinking stderr; then
-         $EGREP " -L.*\/new\/lib -lb -L.*\/old\/lib -lcee" stdout
+         $EGREP " -L.*/new/lib -lb -L.*/old/lib -lcee" stdout
        else :; fi], [0], [ignore], [], [echo "wrong link order"])
     ;;
   esac
diff --git a/tests/testsuite b/tests/testsuite
--- a/tests/testsuite
+++ b/tests/testsuite
@@ -20611,11 +20611,11 @@ aix* | interix*) ;;  # These systems have different path syntax
   yesno)
     { set +x
 $as_echo "$at_srcdir/link-order.at:101: if \$EGREP relinking stderr; then
-         \$EGREP \" .*\\/new\\/lib/libb\$shared_ext .*\\/old\\/lib/libcee\$shared_ext\" stdout
+         \$EGREP \" .*/new/lib/libb\$shared_ext .*/old/lib/libcee\$shared_ext\" stdout
        else :; fi"
 at_fn_check_prepare_notrace 'an embedded newline' "link-order.at:101"
 ( $at_check_trace; if $EGREP relinking stderr; then
-         $EGREP " .*\/new\/lib/libb$shared_ext .*\/old\/lib/libcee$shared_ext" stdout
+         $EGREP " .*/new/lib/libb$shared_ext .*/old/lib/libcee$shared_ext" stdout
        else :; fi
 ) >>"$at_stdout" 2>>"$at_stderr" 5>&-
 at_status=$? at_failed=false
@@ -20633,11 +20633,11 @@ $at_traceon; }
   *)
     { set +x
 $as_echo "$at_srcdir/link-order.at:106: if \$EGREP relinking stderr; then
-         \$EGREP \" -L.*\\/new\\/lib -lb -L.*\\/old\\/lib -lcee\" stdout
+         \$EGREP \" -L.*/new\\/lib -lb -L.*/old/lib -lcee\" stdout
        else :; fi"
 at_fn_check_prepare_notrace 'an embedded newline' "link-order.at:106"
 ( $at_check_trace; if $EGREP relinking stderr; then
-         $EGREP " -L.*\/new\/lib -lb -L.*\/old\/lib -lcee" stdout
+         $EGREP " -L.*/new/lib -lb -L.*/old/lib -lcee" stdout
        else :; fi
 ) >>"$at_stdout" 2>>"$at_stderr" 5>&-
 at_status=$? at_failed=false
/gnu/packages?id=e5f6d0ecafba223031d8f379a91961842ca593a6&amp;showmsg=1'>packages</a>/<a href='/guix/log/gnu/packages/pkg-config.scm?id=e5f6d0ecafba223031d8f379a91961842ca593a6&amp;showmsg=1'>pkg-config.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/pkg-config.scm?id=e5f6d0ecafba223031d8f379a91961842ca593a6'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2023-03-06 21:27:06 -0500'>2023-03-06</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/pkg-config.scm?id=ff5f34ae757d709987896d6164bf125319a0f764'>gnu: perl-extutils-pkgconfig: Support cross-compilation.</a></td><td>Maxim Cournoyer</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* guix/search-paths.scm ($PKG_CONFIG_PATH): New variable.
* gnu/packages/pkg-config.scm (%pkg-config): Use it.
* gnu/packages/perl.scm (perl-extutils-pkgconfig-for-target): New procedure.
(perl-extutils-pkgconfig): Turn into a syntax that
conditionally expands to...
(cross-perl-extutils-pkgconfig): ... this when %current-target-system is set,
or...
(%perl-extutils-pkgconfig): ... this in a native compilation context.
[arguments]: New field.
[propagated-inputs]: Turn into...
[native-inputs]: ... this.
[native-search-paths]: New field.


</td></tr>
<tr class='logheader'><td><span title='2022-09-13 02:04:59 -0400'>2022-09-13</span></td><td class='logsubject'><a href='/guix/commit/gnu/packages/pkg-config.scm?id=eda94d13d4b1845c398ceee34c6bff7364bceaa6'>gnu: Add pkgconf.</a></td><td>Maxim Cournoyer</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/packages/pkg-config.scm (pkgconf): New variable.


</td></tr>