Merge r163954 - 'ar T' is not portable and breaks the build on FreeBSD

https://bugs.webkit.org/show_bug.cgi?id=128596

Patch by Ryan Lortie <desrt@desrt.ca> on 2014-02-12
Reviewed by Gustavo Noronha Silva.

Create thin archives only if we are using GNU ar.

* Source/autotools/SetupLibtool.m4:

ChangeLog

@@ -1,3 +1,14 @@
+2014-02-12  Ryan Lortie  <desrt@desrt.ca>
+
+        'ar T' is not portable and breaks the build on FreeBSD
+        https://bugs.webkit.org/show_bug.cgi?id=128596
+
+        Reviewed by Gustavo Noronha Silva.
+
+        Create thin archives only if we are using GNU ar.
+
+        * Source/autotools/SetupLibtool.m4:
+
 2014-02-09  Carlos Garnacho  <carlosg@gnome.org>
 
         [GTK] Enable touch features

Source/autotools/SetupLibtool.m4

@@ -6,7 +6,11 @@ AC_SUBST([LIBJAVASCRIPTCOREGTK_VERSION])
 AC_SUBST([LIBWEBKIT2GTK_VERSION])
 
 if test -z "$AR_FLAGS"; then
-    AR_FLAGS="cruT"
+    if "${AR:-ar}" -V | grep -q 'GNU ar'; then
+        AR_FLAGS="cruT"
+    else
+        AR_FLAGS="cru"
+    fi
 fi
 AC_SUBST([AR_FLAGS])