net/libvncserver: Fix build with libva

- Add new option to select whether to compile with VAAPI support,
  so that if multimedia/libva is already installed on the system
  during the build process, it is not linked to unless desired.
- Add patch to allow h.264 support to build using libva deprecated API

PR:		210533
Submitted by:	cpm
Reported by:	Walter Schwarzenfeld <w.schwarzenfeld@utanet.at>
Approved by:	adamw (mentor)
Differential Revision:	https://reviews.freebsd.org/D6974

net/libvncserver/Makefile

@@ -24,7 +24,7 @@ CPPFLAGS+=	-I${LOCALBASE}/include
 LDFLAGS+=	-L${LOCALBASE}/lib
 INSTALL_TARGET=	install-strip
 
-OPTIONS_DEFINE=		GCRYPT IPV6
+OPTIONS_DEFINE=		GCRYPT IPV6 VAAPI
 OPTIONS_SINGLE=		SSL
 OPTIONS_SINGLE_SSL=	GNUTLS OPENSSL
 OPTIONS_DEFAULT=	OPENSSL
@@ -43,6 +43,9 @@ GCRYPT_CONFIGURE_WITH=	gcrypt
 
 IPV6_CONFIGURE_WITH=	ipv6
 
+VAAPI_LIB_DEPENDS=	libva.so:multimedia/libva
+VAAPI_CONFIGURE_WITH=	libva
+
 post-install:
 	${INSTALL_DATA} ${WRKSRC}/rfb/default8x16.h ${STAGEDIR}${PREFIX}/include/rfb
 

net/libvncserver/files/patch-libvncclient_h264.c

@@ -0,0 +1,13 @@
+--- libvncclient/h264.c.orig	2016-06-26 17:53:47 UTC
++++ libvncclient/h264.c
+@@ -20,6 +20,10 @@
+ #ifdef LIBVNCSERVER_CONFIG_LIBVA
+ 
+ #include <X11/Xlib.h>
++#include <va/va_version.h>
++#if VA_CHECK_VERSION(0,39,2)
++#include <va/va_compat.h>
++#endif
+ #include <va/va_x11.h>
+ 
+ enum _slice_types {