COntribs: fix gnutls build on OSX

(cherry picked from commit 407756f250d57b50b6bd20be74c7247c94ce3a3f)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/gnutls/gnutls-pkgconfig-osx.patch

@@ -39,11 +39,12 @@
  Libs.private: @UNBOUND_LIBS@
  Requires.private: gnutls
  Cflags: -I${includedir}
---- gnutls/lib/gnutls.pc.in.orig	2014-08-26 00:12:38.680157601 +0200
-+++ gnutls/lib/gnutls.pc.in	2014-08-26 00:13:14.807453832 +0200
-@@ -20,4 +20,4 @@
+--- gnutls-3.2.17/lib/gnutls.pc.in.orig	2014-09-02 02:11:18.408515190 +0200
++++ gnutls-3.2.17/lib/gnutls.pc.in	2014-09-02 02:11:45.615686000 +0200
+@@ -20,5 +20,5 @@
  Version: @VERSION@
- @GNUTLS_REQUIRES_PRIVATE@
+ Libs: -L${libdir} -lgnutls
+ Libs.private: @LTLIBZ@ @LTLIBINTL@ @LIBSOCKET@ @LTLIBPTHREAD@ @LTLIBICONV@ @P11_KIT_LIBS@ @LIB_SELECT@ @TSS_LIBS@ @GMP_LIBS@
+-@GNUTLS_REQUIRES_PRIVATE@
++@GNUTLS_REQUIRES_PRIVATE@ @INTL_MACOSX_LIBS@
  Cflags: -I${includedir}
--Libs:  -L${libdir} -lgnutls  @LTLIBZ@ @LTLIBINTL@ @LIBSOCKET@ @LTLIBPTHREAD@ @LTLIBICONV@ @P11_KIT_LIBS@ @LIB_SELECT@ @TSS_LIBS@ @GMP_LIBS@
-+Libs:  -L${libdir} -lgnutls  @LTLIBZ@ @LTLIBINTL@ @LIBSOCKET@ @LTLIBPTHREAD@ @LTLIBICONV@ @P11_KIT_LIBS@ @LIB_SELECT@ @TSS_LIBS@ @GMP_LIBS@ @INTL_MACOSX_LIBS@