Fix false positive alarms on missed <algortihm> or <utility> header.

The case of a non-STL realization of the one of the functions under test that
is called via class name/namespace resolution syntax (e.g. type type::min)
was not handled by the RE.

cpplint/cpplint.py

@@ -5320,10 +5320,10 @@ _RE_PATTERN_STRING = re.compile(r'\bstring\b')
 _re_pattern_headers_maybe_templates = []
 for _header, _templates in _HEADERS_MAYBE_TEMPLATES:
   for _template in _templates:
-    # Match max<type>(..., ...), max(..., ...), but not foo->max, foo.max or
-    # type::max().
+    # Match max<type>(..., ...), max(..., ...), ::max(..., ...) but not
+    # foo->max, foo.max or type::max().
     _re_pattern_headers_maybe_templates.append(
-        (re.compile(r'[^>.]\b' + _template + r'(<.*?>)?\([^\)]'),
+        (re.compile(r'[^>.](?<!\w::)\b' + _template + r'(<.*?>)?\([^\)]'),
             _template,
             _header))