libvpx: Pull from upstream

source/libvpx/build/make/configure.sh

 #!/bin/sh
 ##
 ##  configure.sh
 ##
 ##  This script is sourced by the main configure script and contains
 ##  utility functions and other common bits that aren't strictly libvpx
 ##  related.
 ##
 ##  This build system is based in part on the FFmpeg configure script.
 ##
@@ skipping 319 matching lines @@
     check_cc "$@" <<EOF
 int x;
 EOF
 }
 
 check_cxxflags() {
     log check_cxxflags "$@"
 
     # Catch CFLAGS that trigger CXX warnings
     case "$CXX" in
-      *g++*) check_cxx -Werror "$@" <<EOF
+      *c++-analyzer|*clang++|*g++*) check_cxx -Werror "$@" <<EOF
 int x;
 EOF
       ;;
       *) check_cxx "$@" <<EOF
 int x;
 EOF
       ;;
     esac
 }
 
@@ skipping 989 matching lines @@
     # Prepare the PWD for building.
     for f in ${OOT_INSTALLS}; do
             install -D ${source_path}/$f $f
     done
     fi
     cp ${source_path}/build/make/Makefile .
 
     clean_temp_files
     true
 }