gnutls: link against CoreFoundation and the Security frameworks as it is required by the keychain certificate lookup patch
gnutls: link against CoreFoundation and the Security frameworks as it is required by the keychain certificate lookup patch

(cherry picked from commit c2b866499d6b43450c97905be29081a93316cb8c)

Conflicts:
	modules/misc/Modules.am

vlc-mirror/vlc-2.1,jomanmuk/vlc-2.1,jomanmuk/vlc-2.1,vlc-mirror/vlc-2.1,vlc-mirror/vlc-2.1,vlc-mirror/vlc-2.1,vlc-mirror/vlc-2.1,jomanmuk/vlc-2.1,jomanmuk/vlc-2.1,jomanmuk/vlc-2.1,jomanmuk/vlc-2.1,vlc-mirror/vlc-2.1,vlc-mirror/vlc-2.1,jomanmuk/vlc-2.1