libraries/imlib2: Remove unexpanded variable from imlib2-config

Signed-off-by: Robby Workman <rworkman@slackbuilds.org>

libraries/imlib2/imlib2.SlackBuild

@@ -69,6 +69,10 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \;
 
+if ! grep -q "my_libs" configure.ac 2>/dev/null; then
+  sed -i 's|@my_libs@||' $PRGNAM-config.in
+fi
+
 CFLAGS="$SLKCFLAGS" \
 CXXFLAGS="$SLKCFLAGS" \
 ./configure \