contrib: enable sse3 optimizations for vp8

These were disabled in 2015 due to an access violation on windows. The
problem should be fixed with 8ba5895.

Change-Id: I0c2774de2728b315c8d434db87d488a80afdc26a

contrib/src/vpx/rules.mak

@@ -100,10 +100,6 @@ ifdef HAVE_IOS
 	VPX_CONF += --disable-runtime-cpu-detect
 endif
 
-ifdef HAVE_WIN32
-VPX_CONF +=	--disable-ssse3
-endif
-
 ifndef HAVE_WIN32
 VPX_CONF += --enable-pic
 endif