CMake: pro2cmake: Skip conversion of doc snippets

Most of them are hand-written.

Change-Id: Ia3d83cdc9e279420c9b4700993b428e10cf8fb22
Reviewed-by: Leander Beernaert <leander.beernaert@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

util/cmake/pro2cmake.py

@@ -40,6 +40,7 @@ import sys
 import re
 import io
 import glob
+import fnmatch
 
 from condition_simplifier import simplify_condition
 from condition_simplifier_cache import set_condition_simplified_cache_enabled
@@ -4092,6 +4093,10 @@ def should_convert_project(project_file_path: str = "", ignore_skip_marker: bool
     if project_relative_path.startswith("tests/auto/tools/qmake/testdata"):
         return False
 
+    # Skip doc snippets.
+    if fnmatch.fnmatch(project_relative_path, "src/*/doc/snippets/*"):
+        return False
+
     # Skip certain config tests.
     config_tests = [
         # Relative to qtbase/config.tests