After the "CMake: make compile options consistent for Qt created libraries"
revert, this part of the code also get reverted, however, it's not
related to the revert reason: the user project's deprecation behavior
is changed. So restore this code. We need this code to make sure
we use the same parameters when compiling QtLibraryInfo, otherwise
some compilers may complain about it, such as clang-cl.
Pick-to: 6.6 6.5
Change-Id: Ie50d4f820be3a2e950dd87902d794f1d2681b7a5
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
71c9b9f05b