libvpx: Add support for building libvpx under 64bit Windows.

generate_gypi.sh

Index: generate_gypi.sh
===================================================================
--- generate_gypi.sh	(revision 179051)
+++ generate_gypi.sh	(working copy)
@@ -166,6 +166,7 @@
 gen_config_files linux/arm-neon "--target=armv7-linux-gcc --enable-pic --enable-realtime-only ${all_platforms}"
 gen_config_files linux/mipsel "--target=mips32-linux-gcc --disable-fast-unaligned ${all_platforms}"
 gen_config_files win/ia32 "--target=x86-win32-vs7 --enable-realtime-only ${all_platforms}"
+gen_config_files win/x64 "--target=x86_64-win64-vs9 --enable-realtime-only ${all_platforms}"
 gen_config_files mac/ia32 "--target=x86-darwin9-gcc --enable-pic --enable-realtime-only ${all_platforms}"
 gen_config_files mac/x64 "--target=x86_64-darwin9-gcc --enable-pic --enable-realtime-only ${all_platforms}"
 
@@ -179,6 +180,7 @@
 lint_config linux/arm
 lint_config linux/arm-neon
 lint_config win/ia32
+lint_config win/x64
 lint_config mac/ia32
 lint_config mac/x64
 
@@ -194,6 +196,7 @@
 gen_rtcd_header linux/arm-neon armv7
 gen_rtcd_header linux/mipsel mipsel
 gen_rtcd_header win/ia32 x86
+gen_rtcd_header win/x64 x86_64
 gen_rtcd_header mac/ia32 x86
 gen_rtcd_header mac/x64 x86_64