patch 9.1.1399: tests: test_codestyle fails for auto-generated files

Problem:  tests: test_codestyle fails for auto-generated files.
          While those files are already ignored in Test_source_Files(),
          the newly added Test_indent_of_source_files() does not filter
          those out and causes test failures on appveyor.
Solution: factor out the generation of all c files into a common function
          and filter out auto-generated files if_ole.h, iid_ole.c and
          dlldata.c

closes: #17352

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index a63fc09..570bfe4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -710,6 +710,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1399,
+/**/
     1398,
 /**/
     1397,