Skip rewriting headers that reference SkM44.h until we can remove the private copy of it

Change-Id: I4c390fa4e2eae71203c688433569a7afb5e02642
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/272535
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/tools/rewrite_includes.py b/tools/rewrite_includes.py
index 2d9a26c..42e8626 100755
--- a/tools/rewrite_includes.py
+++ b/tools/rewrite_includes.py
@@ -51,7 +51,7 @@
   for path, _, files in os.walk(root):
     if not any(snippet in fix_path(path) for snippet in ignorelist):
       for file_name in files:
-        if file_name.endswith('.h'):
+        if file_name.endswith('.h') and 'SkM44' not in file_name:
           if file_name in headers:
             print path, file_name, headers[file_name]
           assert file_name not in headers