Changed default compiler to gcc (since on Snow Leopard 10.6 gcc is the default)

On a clean Snow Leopard system, and installing Xcode 4.2 (the last Xcode for SL), the default compiler is gcc (i686-apple-darwin10-llvm-gcc-4.2)
diff --git a/Makefile b/Makefile
index c2829c1..3176052 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-IOS_CC = clang
+IOS_CC = gcc
 IOS_SDK = /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk
 
 all: clean ios-deploy