_build.sh: limit binutils strip use to boringssl/awslc builds [ci skip]

It'd be interesting to re-evaluate if the clang/llvm strip issues are
fixed, or binutils strip is still necessary to strip some timestamps and
other non-reproducible data from boringssl/awslc objects (nasm,
undisablable debug info).

Author: vszakats

_build.sh

@@ -1357,7 +1357,7 @@ build_single_target() {
 
   # for boringssl/awslc
   export _STRIP_BINUTILS=''
-  if [ "${_OS}" = 'win' ] && [ "${_CC}" = 'llvm' ]; then
+  if [ "${_OS}" = 'win' ] && [ "${_CC}" = 'llvm' ] && [ "${boringssl}" = '1' ]; then
     if [ "${_CPU}" = 'x64' ] || \
        [ "${_CPU}" = 'x86' ]; then
       # Make sure to pick the prefixed binutils strip tool from an unmodified