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gen_msvs_vcxproj.sh: Add /arch:AVX for files using AVX.

Turns on AVX when the final characters of .c and .cc file names preceding the
.c and .cc file extension contain the substrings avx or avx2. This silences
many MSVC warnings issued during compilation files that use AVX.

Change-Id: I82bda394af7a688679abab2a50dd7e10b3cb0c7a

--- a/build/make/gen_msvs_vcxproj.sh

+++ b/build/make/gen_msvs_vcxproj.sh

@@ -174,6 +174,10 @@

                         Include=".\\$f"

                     # Separate file names with Condition?

                     tag_content ObjectFileName "\$(IntDir)$objf"

+                    # Check for AVX and turn it on to avoid warnings.

+                    if [[ $f =~ avx.?\.c$ ]]; then

+                        tag_content AdditionalOptions "/arch:AVX"

+                    fi

                     close_tag ClCompile

                 elif [ "$pat" == "h" ] ; then

                     tag ClInclude \