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configure: test for -Wshorten-64-to-32 in non hbd builds

provides msvc-like warnings for implicit conversions from 64-bit to
32-bit types

--enable-vp9-highbitdepth still requires some work

this also skips CXXFLAGS for now as some work would be needed to cleanup
third_party/*.cc or split it from test/*.cc where it comes to flags.

Change-Id: Ic9a095b73286eba5ed39bfc27ff69593748cbbf4

--- a/configure

+++ b/configure

@@ -586,6 +586,11 @@

         if enabled mips || [ -z "${INLINE}" ]; then

           enabled extra_warnings || check_add_cflags -Wno-unused-function

         fi

+        if ! enabled vp9_highbitdepth; then

+          # Avoid this warning for third_party C++ sources. Some reorganization

+          # would be needed to apply this only to test/*.cc.

+          check_cflags -Wshorten-64-to-32 && add_cflags_only -Wshorten-64-to-32

+        fi

     fi

     if enabled icc; then