patch 9.1.0606: tests: generated files may cause failure in test_codestyle

patch 9.1.0606: tests: generated files may cause failure in test_codestyle

Problem:  tests: generated files may cause failure in test_codestyle
Solution: Exclude OLE-related generated files from style checks.
          (Ken Takata)

Some OLE-related auto-generated files may contain space errors:
https://ci.appveyor.com/project/chrisbra/vim-win32-installer/builds/50248542/job/w45ve9yd6qmmws8t#L11475
```
	From test_codestyle.vim:
	Found errors in Test_source_files():
	command line..script C:/projects/vim-win32-installer/vim/src/testdir/runtest.vim[607]..function RunTheTest[57]..Test_source_files[8]..<SNR>8_PerformCheck[11]..<SNR>8_ReportError line 2: ../dlldata.c line 2: trailing white space
	command line..script C:/projects/vim-win32-installer/vim/src/testdir/runtest.vim[607]..function RunTheTest[57]..Test_source_files[8]..<SNR>8_PerformCheck[11]..<SNR>8_ReportError line 2: ../iid_ole.c line 12: trailing white space
	command line..script C:/projects/vim-win32-installer/vim/src/testdir/runtest.vim[607]..function RunTheTest[57]..Test_source_files[6]..<SNR>8_PerformCheck[11]..<SNR>8_ReportError line 2: ../if_ole.h line 60: space before Tab
	command line..script C:/projects/vim-win32-installer/vim/src/testdir/runtest.vim[607]..function RunTheTest[57]..Test_source_files[8]..<SNR>8_PerformCheck[11]..<SNR>8_ReportError line 2: ../if_ole.h line 10: trailing white space
```

Exclude them from style checking.

closes: #15309

Signed-off-by: Ken Takata <kentkt@csc.jp>
Signed-off-by: Christian Brabandt <cb@256bit.org>