Allow Windows simulations for fonts with EBDT/EBLC bitmap strikes

Korean fonts Gulim, Dotum, Batang, Gungsuh have bitmap strikes that get
artifically emboldened by Windows without antialiasing. Korean users
prefer these over the synthetic boldening performed by Skia. So let's
make an exception for fonts with bitmap strikes and allow passing
through Windows simulations for those, until Skia provides more control
over simulations in font matching.

Fixed: chromium:1258378
Change-Id: I66d7cfd5bc5a4262db401b51aad4d384a2b11d25
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/458536
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed