clangqdoc can't parse platform dependent source files
because they try to include platform dependent system
include files. e.g., When clangqdoc is run on macOS,
the Windows system include files are not available.
This change adds all the platform dependent .cpp files
to the excludefiles config variable. This means that
qdoc comments are no longer allowed in the excluded
files. There shouldn't be any documentation in these
files anyway. Platform dependent documentation should
be in .qdoc files or in generic .cpp files that do not
try to include platform dependent include files.
Note that .m and .mm files are excluded programatically
in qdoc.
Change-Id: I8f93fe9f5604e558b3df8c8cc8ee723010bf885d
Reviewed-by: Martin Smith <martin.smith@qt.io>
1885952c23