WIN64: 'libQt5Multimedia.a: No such file or directory' error during QtDoc build

Hello, everyone,

Got errors for QtDoc builds using mingw-w64:

g++: error: C:\libQT-5.12-dev\build\qtmultimedia\lib\libQt5Multimedia.a: No such file or directory
mingw32-make[5]: *** [Makefile.Release:64: release/maroon.exe] Error 1

and MSVC:

C:\libQT-5.12-dev\build\qtdoc\examples\demos\maroon\Makefile.Release [release\maroon.exe] Error 1181

which relate to recently merged Change #232532 and missing QtDoc dependency of QtMultimedia, see Change #235555.

Reproduced for:

• builds using mingw-w64, Windows ICC and MSVC regardledd of used Configuration and Layout.

Re-running make job finishes without errors and 'maroon.exe' built successfully. Which can be evidence, that error relate to Qt Build System.

CC: buddenha, frederik, veshivas.

Best,

Alexander