tools: Use the latest version of gas-pp

This is required for building libav from yesterday for iOS.
Signed-off-by: Martin Storsjö <martin@martin.st>

extras/tools/packages.mak

@@ -32,7 +32,7 @@ XZ_URL=http://tukaani.org/xz/xz-$(XZ_VERSION).tar.bz2
 OPENSSL_VERSION=1.0.0e
 OPENSSL_URL=http://www.openssl.org/source/openssl-$(OPENSSL_VERSION).tar.gz
 
-GAS_VERSION=c76b628
+GAS_VERSION=0b4738e
 GAS_URL=http://git.libav.org/?p=gas-preprocessor.git;a=snapshot;h=$(GAS_VERSION);sf=tgz
 
 RAGEL_VERSION=6.8