Modify create clue list so R packages are detected (#12277)

R packages can contain configure scripts so R needs to be before
autotools in the clue list.

lib/spack/spack/cmd/create.py

@@ -473,13 +473,13 @@ def __call__(self, stage, url):
         # build systems, we choose the first match in this list.
         clues = [
             (r'/CMakeLists\.txt$',    'cmake'),
+            (r'/NAMESPACE$',          'r'),
             (r'/configure$',          'autotools'),
             (r'/configure\.(in|ac)$', 'autoreconf'),
             (r'/Makefile\.am$',       'autoreconf'),
             (r'/SConstruct$',         'scons'),
             (r'/waf$',                'waf'),
             (r'/setup\.py$',          'python'),
-            (r'/NAMESPACE$',          'r'),
             (r'/WORKSPACE$',          'bazel'),
             (r'/Build\.PL$',          'perlbuild'),
             (r'/Makefile\.PL$',       'perlmake'),