Fix libtool and LDFLAGS reordering issues

This is a Debian patch (from #347650) that makes libtool play nicely
with "-Wl,--as-needed".

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>
Signed-off-by: Dan McGee <dan@archlinux.org>

ltmain.sh

@@ -5790,6 +5790,11 @@ func_mode_link ()
 	arg=$func_stripname_result
 	;;
 
+      -Wl,--as-needed|-Wl,--no-as-needed)
+	deplibs="$deplibs $arg"
+	continue
+	;;
+
       -Wl,*)
 	func_stripname '-Wl,' '' "$arg"
 	args=$func_stripname_result
@@ -6150,6 +6155,15 @@ func_mode_link ()
 	lib=
 	found=no
 	case $deplib in
+	-Wl,--as-needed|-Wl,--no-as-needed)
+	  if test "$linkmode,$pass" = "prog,link"; then
+	    compile_deplibs="$deplib $compile_deplibs"
+	    finalize_deplibs="$deplib $finalize_deplibs"
+	  else
+	    deplibs="$deplib $deplibs"
+	  fi
+	  continue
+	  ;;
 	-mt|-mthreads|-kthread|-Kthread|-pthread|-pthreads|--thread-safe|-threads)
 	  if test "$linkmode,$pass" = "prog,link"; then
 	    compile_deplibs="$deplib $compile_deplibs"