Fix binary compatibility issue caused by VAAPI ISO-C conformance fix

Signed-off-by: Austin Yuan <shengquan.yuan@intel.com>

src/Makefile.am

@@ -28,6 +28,7 @@ libva_la_LTLIBRARIES = libva.la
 libva_ladir = $(libdir)
 libva_la_LDFLAGS = -version-number 0:30:0 -no-undefined
 libva_la_LIBADD = $(LIBVA_LIBS) -ldl -ldrm -lX11 -lXext -lXv X11/libva_X11.la
+CFLAGS = -ansi -O2 
 
 SUBDIRS = X11
 

src/X11/Makefile.am

@@ -26,3 +26,4 @@ libva_X11includedir =  ${includedir}/va
 libva_X11include_HEADERS = va_x11.h va_dri.h va_dri2.h
 
 libva_X11_la_SOURCES = va_x11.c va_dri.c va_dri2.c
+CFLAGS = -ansi -O2