use filter_file instead of patch

var/spack/packages/py-numpy/gnu_fcompiler.patch

@@ -1,11 +0,0 @@
---- a/numpy/distutils/fcompiler/gnu.py.orig	2015-08-17 11:31:52.000000000 -0700
-+++ b/numpy/distutils/fcompiler/gnu.py	2015-08-17 11:32:48.000000000 -0700
-@@ -252,7 +252,7 @@
-     #       GNU Fortran 95 (GCC) 4.2.0 20060218 (experimental)
-     #       GNU Fortran (GCC) 4.3.0 20070316 (experimental)
- 
--    possible_executables = ['gfortran', 'f95']
-+    possible_executables = ['fc', 'f95']
-     executables = {
-         'version_cmd'  : ["<F90>", "--version"],
-         'compiler_f77' : [None, "-Wall", "-g", "-ffixed-form",

var/spack/packages/py-numpy/package.py

@@ -8,13 +8,18 @@ class PyNumpy(Package):
     version('1.9.1', '78842b73560ec378142665e712ae4ad9')
     version('1.9.2', 'a1ed53432dbcd256398898d35bc8e645')
     
-    patch('gnu_fcompiler.patch', when='%gcc')
-
     extends('python')
     depends_on('py-nose')
     depends_on('netlib-blas+fpic')
     depends_on('netlib-lapack+shared')
 
+    def patch(self):
+        filter_file(
+            "possible_executables = \['(gfortran|g77|ifort|efl)",
+            "possible_executables = ['fc",
+            "numpy/distutils/fcompiler/gnu.py",
+            "numpy/distutils/fcompiler/intel.py")
+
     def install(self, spec, prefix):
         with open('site.cfg', 'w') as f:
             f.write('[DEFAULT]\n')