Causes segmentation fault on powerpc when building py-scipy.

See discussion at:
https://github.com/numpy/numpy/issues/5451

Index: numpy/distutils/fcompiler/gnu.py
--- numpy/distutils/fcompiler/gnu.py.orig
+++ numpy/distutils/fcompiler/gnu.py
@@ -245,7 +245,6 @@ class GnuFCompiler(FCompiler):
             opt = ['-O2']
         else:
             opt = ['-O3']
-        opt.append('-funroll-loops')
         return opt
 
     def _c_arch_flags(self):