libtool: add upstream patch to allow -stdlib= flag

Formula/libtool.rb

@@ -10,10 +10,10 @@ class Libtool < Formula
   sha1 '22b71a8b5ce3ad86e1094e7285981cae10e6ff88'
 
   bottle do
-    revision 1
-    sha1 '3a025da1e80c2965f0eee2591fca225315f97290' => :mavericks
-    sha1 'bd62a22ee51cceec5e359d33f6b19d217368166d' => :mountain_lion
-    sha1 '0cf484aa89183c6b3228c0f156229c787f996f89' => :lion
+    revision 2
+    sha1 '860a75329b31aa8729d71438d6a696fd453a85e4' => :mavericks
+    sha1 'd97af1451dd547b5857bddfa8e5f241fd78d7c9d' => :mountain_lion
+    sha1 '6873a7b72e86f369f43125c0e29ae5cdbc2d67c1' => :lion
   end
 
   if MacOS::Xcode.provides_autotools? or File.file? "/usr/bin/glibtoolize"
@@ -22,6 +22,11 @@ class Libtool < Formula
 
   option :universal
 
+  # Allow -stdlib= to pass through to linker
+  # http://git.savannah.gnu.org/gitweb/?p=libtool.git;a=commitdiff;h=8f975a1368594126e37d85511f1f96164e466d93
+  # https://trac.macports.org/ticket/32982
+  def patches; DATA; end
+
   def install
     ENV.universal_binary if build.universal?
     system "./configure", "--disable-dependency-tracking",
@@ -41,3 +46,21 @@ class Libtool < Formula
     system "#{bin}/glibtool", 'execute', '/usr/bin/true'
   end
 end
+
+__END__
+diff --git a/libltdl/config/ltmain.sh b/libltdl/config/ltmain.sh
+index 63ae69d..9ae038c 100644
+--- a/libltdl/config/ltmain.sh
++++ b/libltdl/config/ltmain.sh
+@@ -5851,9 +5851,10 @@ func_mode_link ()
+       # -tp=*                Portland pgcc target processor selection
+       # --sysroot=*          for sysroot support
+       # -O*, -flto*, -fwhopr*, -fuse-linker-plugin GCC link-time optimization
++      # -stdlib=*            select c++ std lib with clang
+       -64|-mips[0-9]|-r[0-9][0-9]*|-xarch=*|-xtarget=*|+DA*|+DD*|-q*|-m*| \
+       -t[45]*|-txscale*|-p|-pg|--coverage|-fprofile-*|-F*|@*|-tp=*|--sysroot=*| \
+-      -O*|-flto*|-fwhopr*|-fuse-linker-plugin)
++      -O*|-flto*|-fwhopr*|-fuse-linker-plugin|-stdlib=*)
+         func_quote_for_eval "$arg"
+ 	arg="$func_quote_for_eval_result"
+         func_append compile_command " $arg"