Android: Fix compilation on Windows

151cf2047aa36ac395a841a3ced8b2142a997aec broke cross-compilation
for Android on Windows, since evdev-support was detected, but
there was no corresponding test to disable the mtdev-code in the
evdev files.

Task-number: QTBUG-38155
Change-Id: Ifb08fa1160a348ef64b970a89922e66dc6ddd263
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>