configure: add check for AVX inline support

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -4392,7 +4392,8 @@ EOF
     check_inline_asm inline_asm_direct_symbol_refs '"movl '$extern_prefix'test, %eax"' ||
         check_inline_asm inline_asm_direct_symbol_refs '"movl '$extern_prefix'test(%rip), %eax"'
 
-    # check whether binutils is new enough to compile SSSE3/MMXEXT
+    # check whether binutils is new enough to compile AVX/SSSE3/MMXEXT
+    enabled avx    && check_inline_asm avx_inline    '"vextractf128 $1, %ymm0, %xmm1"'
     enabled ssse3  && check_inline_asm ssse3_inline  '"pabsw %xmm0, %xmm0"'
     enabled mmxext && check_inline_asm mmxext_inline '"pmaxub %mm0, %mm1"'