Merge commit '9e3946aa'

* commit '9e3946aa':
  build: Require yasm 0.8.0 or higher

Conflicts:
	configure

If someone wants to continue supporting older yasm/nasm versions, patches are of course welcome!
Merged-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -4018,8 +4018,8 @@ EOF
             elf*) enabled debug && append YASMFLAGS $yasm_debug ;;
         esac
 
-        check_yasm "pextrd [eax], xmm0, 1" && enable yasm ||
-            die "yasm not found, use --disable-yasm for a crippled build"
+        check_yasm "movbe ecx, [5]" && enable yasm ||
+            die "yasm/nasm not found or too old. Use --disable-yasm for a crippled build."
         check_yasm "vextractf128 xmm0, ymm0, 0"      || disable avx_external avresample
         check_yasm "vfmaddps ymm0, ymm1, ymm2, ymm3" || disable fma4_external
         check_yasm "CPU amdnop" && enable cpunop