This reverts 5d630caabd (Make it enough to predefine only
wxUSE_DPI_AWARE_MANIFEST, 2023-08-23) and all the commits which tried to
fix the breakage caused by it.
While the original change had merit, it seems to be too difficult to fix
all our build systems to avoid embedding manifest when defining this in
the code, like samples/sample.rc does, so revert this change for now.
Maybe it can be reintroduced in the future after switching to some other
build system.
d69ddb8656