python: use raw string for regex with escape

Python regards 'GPT\.INI$' as a string containing an invalid escape
sequence '\.', which is ignored (i.e. treated as the literal sequence
of those 2 characters), but only after Python has grumbled to itself,
and to you if you enabled DeprecationWarnings.

The proper thing to do here is use r-strings, like r'GPT\.INI$', which
tell Python that all backslashes are literal. Alternatively (as we do
once in this patch), the backslash can itself be escaped ('\\').

There are more problems of this nature in the build scripts.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Noel Power <npower@samba.org>

python/samba/gp_parse/gp_inf.py

@@ -319,7 +319,7 @@ class GptTmplInfParser(GPParser):
         current_header_name = None
 
         for line in inf_file.splitlines():
-            match = re.match('\[(.*)\]', line)
+            match = re.match(r'\[(.*)\]', line)
             if match:
                 header_name = match.group(1)
                 if header_name in self.sections: