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 1181 matching lines @@
 
     if enabled optimizations; then
         if enabled rvct; then
             enabled small && check_add_cflags -Ospace || check_add_cflags -Otime
         else
             enabled small && check_add_cflags -O2 ||  check_add_cflags -O3
         fi
     fi
 
     # default use_x86inc to yes if pic is no or 64bit or we are not on darwin
-    echo "  checking here for x86inc \"${tgt_isa}\" \"$pic\" "
-    if [ ${tgt_isa} = x86_64 -o ! "$pic" = "yes" -o "${tgt_os#darwin}" = "${tgt_os}"  ]; then
+    if [ ${tgt_isa} = x86_64 -o ! "$pic" = "yes" -o \
+         "${tgt_os#darwin}" = "${tgt_os}"  ]; then
       soft_enable use_x86inc
     fi
 
     # Position Independent Code (PIC) support, for building relocatable
     # shared objects
     enabled gcc && enabled pic && check_add_cflags -fPIC
 
     # Work around longjmp interception on glibc >= 2.11, to improve binary
     # compatibility. See http://code.google.com/p/webm/issues/detail?id=166
     enabled linux && check_add_cflags -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0
@@ skipping 126 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
 }