OSX: switch to 64 bit build

Author: facchinm

package-avr-gcc.bash

@@ -76,9 +76,9 @@ elif [[ $OS == "Msys" || $OS == "Cygwin" ]] ; then
 elif [[ $OS == "Darwin" ]] ; then
 
   export PATH=/opt/local/libexec/gnubin/:/opt/local/bin:$PATH
-  export CC="gcc -arch i386 -mmacosx-version-min=10.5"
-  export CXX="g++ -arch i386 -mmacosx-version-min=10.5"
-  OUTPUT_TAG=i386-apple-darwin11
+  export CC="gcc -arch x86_64 -mmacosx-version-min=10.8"
+  export CXX="g++ -arch x86_64 -mmacosx-version-min=10.8"
+  OUTPUT_TAG=x86_64-apple-darwin14
 
 else