utils/getdeveloperlib.py: force foward-slash for pattern matching

Force relative file path resolution of DEVELOPERS file entries to use
forward-slash separators since pattern matching assumes forward slashes.
This is to help permit uses invoking `get-developers` on Platforms where
`os.sep` may not be a forward slash.

Signed-off-by: James Knight <james.d.knight@live.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

utils/getdeveloperlib.py

@@ -251,7 +251,10 @@ def parse_developers():
                 if len(dev_files) == 0:
                     print("WARNING: '%s' doesn't match any file" % fname,
                           file=sys.stderr)
-                files += [os.path.relpath(f, brpath) for f in dev_files]
+                for f in dev_files:
+                    dev_file = os.path.relpath(f, brpath)
+                    dev_file = dev_file.replace(os.sep, '/')  # force unix sep
+                    files.append(dev_file)
             elif line == "":
                 if not name:
                     continue