A recent merge upstream causes build faiilures because the
PROJECT_VERSION variiable isn't defined. I can't figure out how to make
sure that it is defined correctly, so hack around that by using the
version prior to that merge.
See https://github.com/LaurentGomila/qt-android-cmake/issues/33
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>