JunitTest_forms_unoapi tests now failing on Windows

[Luke Benes]

Ever since https://cgit.freedesktop.org/libreoffice/core/commit/?id=35a25475

tdf#118786 WIN allow nested SendMessage calls

The JunitTest_forms_unoapi Subsequent Tests have been failing with a "!pInst->mbNoYieldLock" assert. 
https://imgur.com/a/69bk2yI

Here is a pastebin of the end of the log:
https://pastebin.com/HwsaAbMe

$ cat autogen.input
--enable-debug
--enable-64-bit