rename cflags_mapping to CFLAGS_MAPPING

This is PEP8 convention for a const variable. Also, make the type
Mapping, which doesn't have mutation methods. This means mypy will warn
us if someone tries to change this.

1 files changed, 1 insertions, 1 deletions

diff --git a/run_unittests.py b/run_unittests.py
index 5118b00..2f102b4 100755
--- a/run_unittests.py
+++ b/run_unittests.py
@@ -9347,7 +9347,7 @@ def unset_envs():
     # For unit tests we must fully control all command lines
     # so that there are no unexpected changes coming from the
     # environment, for example when doing a package build.
-    varnames = ['CPPFLAGS', 'LDFLAGS'] + list(mesonbuild.compilers.compilers.cflags_mapping.values())
+    varnames = ['CPPFLAGS', 'LDFLAGS'] + list(mesonbuild.compilers.compilers.CFLAGS_MAPPING.values())
     for v in varnames:
         if v in os.environ:
             del os.environ[v]