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Add avx512 compile test.

Some compiler releases allow the -mavx512f arg without actually
implementing support. Test for this situation, and disable avx512
when it is detected by configure.

BUG=webm:1536

Change-Id: I63952153bb4b24aa9f25267ed47a0fe845d61f8b

--- a/build/make/configure.sh

+++ b/build/make/configure.sh

@@ -1333,6 +1333,15 @@

         else

           if [ "$ext" = "avx512" ]; then

             check_gcc_machine_options $ext avx512f avx512cd avx512bw avx512dq avx512vl

+

+            # Confirm that the compiler really supports avx512.

+            check_cc -mavx512f <<EOF || RTCD_OPTIONS="${RTCD_OPTIONS}--disable-avx512 " && soft_disable avx512

+#include <immintrin.h>

+void f(void) {

+  __m512i x = _mm512_set1_epi16(0);

+  (void)x;

+}

+EOF

           else

             # use the shortened version for the flag: sse4_1 -> sse4

             check_gcc_machine_option ${ext%_*} $ext