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 787 matching lines @@
   # Process ARM architecture variants
   case ${toolchain} in
     arm*)
       # on arm, isa versions are supersets
       case ${tgt_isa} in
         arm64|armv8)
           soft_enable neon
           ;;
         armv7|armv7s)
           soft_enable neon
-          soft_enable neon_asm
+          # Only enable neon_asm when neon is also enabled.
+          enabled neon && soft_enable neon_asm
+          # If someone tries to force it through, die.
+          if disabled neon && enabled neon_asm; then
+            die "Disabling neon while keeping neon-asm is not supported"
+          fi
           soft_enable media
           soft_enable fast_unaligned
           ;;
         armv6)
           soft_enable media
           soft_enable fast_unaligned
           ;;
       esac
 
       asm_conversion_cmd="cat"
@@ skipping 292 matching lines @@
               soft_disable avx
               soft_disable avx2
               ;;
           esac
           ;;
       esac
 
       bits=32
       enabled x86_64 && bits=64
       check_cpp <<EOF && bits=x32
-#ifndef __ILP32__
+#if !defined(__ILP32__) || !defined(__x86_64__)
 #error "not x32"
 #endif
 EOF
       case ${tgt_cc} in
         gcc*)
           add_cflags -m${bits}
           add_ldflags -m${bits}
           ;;
       esac
 
@@ skipping 128 matching lines @@
   check_cc <<EOF
 unsigned int e = 'O'<<24 | '2'<<16 | 'B'<<8 | 'E';
 EOF
     [ -f "${TMP_O}" ] && od -A n -t x1 "${TMP_O}" | tr -d '\n' |
         grep '4f *32 *42 *45' >/dev/null 2>&1 && enable_feature big_endian
 
     # Try to find which inline keywords are supported
     check_cc <<EOF && INLINE="inline"
 static inline function() {}
 EOF
-    check_cc <<EOF && INLINE="__inline__ __attribute__((always_inline))"
-static __attribute__((always_inline)) function() {}
-EOF
 
   # Almost every platform uses pthreads.
   if enabled multithread; then
     case ${toolchain} in
       *-win*-vs*)
         ;;
       *-android-gcc)
         ;;
       *)
         check_header pthread.h && add_extralibs -lpthread
@@ skipping 118 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
 }