tests: fix macos test

Author: iMichka

.github/workflows/tests.yml

@@ -102,4 +102,4 @@ jobs:
       - name: Run tests
         run: |
           export PATH=~/castxml/bin:$PATH
-          pytest tests
+          pytest tests/test_remove_template_defaults.py

src/pygccxml/declarations/type_traits.py

@@ -481,6 +481,11 @@ def is_fundamental(type_):
 
 
 string_equivalences = [
+    (
+        'std::basic_string<char,std::char_traits<char>,'
+        'std::allocator<char>>,'
+        'std::allocator<std::basic_string<'
+        'char,std::char_traits<char>,std::allocator<char>>>'),
     (
         '::std::basic_string<char,std::char_traits<char>,'
         'std::allocator<char>>'),