pypy installation doesn't require gcc

plugins/python-build/share/python-build/pypy-1.9

@@ -1,5 +1,3 @@
-require_gcc
-
 case "$OSTYPE" in
 darwin*)
   PYPY_URL="https://bitbucket.org/pypy/pypy/downloads/pypy-1.9-osx64.tar.bz2"