Merge topic 'pchreuse-refactor'

11ee18b758 ci: extend msvc_v71_nmake `RunCMake.PrecompileHeaders` test timeout
1c91fadbe8 Tests/RunCMake/PrecompileHeaders: support extended timeout
42f2867b3b pchreuse: defer dependency addition until generation time
f9bc615d9a pchreuse: ban PCH reuse from targets which disable PCH
f78f592b78 pchreuse: defer target existence enforcement to generation time
3ef773490d pchreuse: defer PCH consistency checks to generation time
1d701491a2 pchreuse: always ask the PCH reuse target for PDB information
6e7da8aa95 cmGeneratorTarget: factor out reuse target computation
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Acked-by: alcroito <alexandru.croitor@qt.io>
Acked-by: Vincent X <gulackeg@gmail.com>
Merge-request: !10887