- Unbreak build on 10.x and -CURRENT

- Use a modern GCC toolchain to unbreak the build on 8.x
- Force 32-bit mode on i386
- Enhance default OPTIONs for a better usability of the port

Supported by:	John Van Sickle <john.vansickle@gmail.com>

multimedia/libav/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	libav
 PORTVERSION=	9.10
+PORTREVISION=	1
 CATEGORIES=	multimedia audio ipv6 net
 MASTER_SITES=	http://libav.org/releases/
 
@@ -26,6 +27,8 @@ CONFIGURE_ARGS+=	--prefix="${PREFIX}" \
 			--enable-pthreads \
 			--enable-shared \
 			--enable-runtime-cpudetect \
+			--disable-debug \
+			--cc="${CC}" \
 			--disable-avserver
 
 OPTIONS_DEFINE=	ALSA AMR_NB AMR_WB BZIP2 CDIO FAAC FDK_AAC FREETYPE FREI0R \
@@ -34,7 +37,7 @@ OPTIONS_DEFINE=	ALSA AMR_NB AMR_WB BZIP2 CDIO FAAC FDK_AAC FREETYPE FREI0R \
 		VO_AACENC VO_AMRWBENC VORBIS VPX X264 XVID ZLIB
 
 OPTIONS_DEFAULT=	BZIP2 FREETYPE FREI0R GNUTLS OPENCV SCHROEDINGER \
-			THEORA VPX X264 XVID
+			THEORA VO_AACENC VORBIS VPX X264 XVID ZLIB
 
 FDK_AAC_DESC=	AAC audio encoding via Fraunhofer FDK
 ILBC_DESC=	iLBC en/decoding via libilbc
@@ -150,6 +153,14 @@ USE_OPENSSL=	yes
 
 .include <bsd.port.pre.mk>
 
+.if ${ARCH} == "i386"
+CONFIGURE_ARGS+=	--extra-cflags=-m32
+.endif
+
+.if ${OSVERSION} < 900000
+USE_GCC=	4.6+
+.endif
+
 .if ${HAVE_SDL:Msdl}
 USE_SDL+=	sdl
 MAN1+=		avplay.1

multimedia/libav/files/patch-libavutil_x86_asm.h

@@ -0,0 +1,11 @@
+--- libavutil/x86/asm.h.orig	2013-11-07 22:15:35.000000000 +0100
++++ libavutil/x86/asm.h	2013-11-07 22:15:52.000000000 +0100
+@@ -68,7 +68,7 @@
+ typedef int x86_reg;
+ #endif
+ 
+-#define HAVE_7REGS (ARCH_X86_64 || (HAVE_EBX_AVAILABLE && HAVE_EBP_AVAILABLE))
++#define HAVE_7REGS (ARCH_X86_64 || (HAVE_EBX_AVAILABLE && HAVE_EBP_AVAILABLE && !defined(__clang__)))
+ #define HAVE_6REGS (ARCH_X86_64 || (HAVE_EBX_AVAILABLE || HAVE_EBP_AVAILABLE))
+ 
+ #if ARCH_X86_64 && defined(PIC)