Define macro __has_builtin for GCC prior to 10
Define macro __has_builtin for GCC prior to 10

Clang and gcc-10 supports macro __has_builtin, and GCC <= 9 lacks of the
support. This patch attempts to make a limited list for the builtin
functions that we might make use of.

DLTcollab/sse2neon,DLTcollab/sse2neon,DLTcollab/sse2neon