perl: avoid --no-cpp-precomp on darwin, (close #1160)

Taken from https://trac.macports.org/ticket/38913
vcunat renamed the patch

pkgs/development/interpreters/perl/5.16/cpp-precomp.patch

@@ -0,0 +1,11 @@
+--- a/hints/darwin.sh	2013-05-08 11:13:45.000000000 -0600
++++ b/hints/darwin.sh	2013-05-08 11:15:04.000000000 -0600
+@@ -129,7 +129,7 @@
+ 
+ # Avoid Apple's cpp precompiler, better for extensions
+ if [ "X`echo | ${cc} -no-cpp-precomp -E - 2>&1 >/dev/null`" = "X" ]; then
+-    cppflags="${cppflags} -no-cpp-precomp"
++    #cppflags="${cppflags} -no-cpp-precomp"
+ 
+     # This is necessary because perl's build system doesn't
+     # apply cppflags to cc compile lines as it should.

pkgs/development/interpreters/perl/5.16/default.nix

@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
       ./no-sys-dirs.patch
     ]
     ++ optional stdenv.isSunOS  ./ld-shared.patch
-    ++ optional stdenv.isDarwin ./no-libutil.patch;
+    ++ stdenv.lib.optional stdenv.isDarwin [ ./cpp-precomp.patch ./no-libutil.patch ] ;
 
   # Build a thread-safe Perl with a dynamic libperls.o.  We need the
   # "installstyle" option to ensure that modules are put under