gapfiller: traverse subdirectories in patch (#14375)

* gapfiller: traverse subdirectories in patch

* gapfiller: revert glob function change

* gapfiller: use more precise glob

var/spack/repos/builtin/packages/gapfiller/package.py

@@ -33,7 +33,7 @@ def url_for_version(self, version):
 
     def patch(self):
         with working_dir('.'):
-            files = glob.iglob("*.pl")
+            files = glob.glob("*.pl") + glob.glob('bwa/*.pl')
             for file in files:
                 change = FileFilter(file)
                 change.filter('usr/bin/perl', 'usr/bin/env perl')