If we install our support libraries into the NDK we later run into
include path order issues that result in strange errors around the
inclusion of math.h (because we find the C version of that include
file that ships with the NDK before we find the libstdc++ version
of math.h (because the include path for our support libraries is
listed before the libstdc++ include search path). By having a distinct
install-root for our libraries we can avoid this problem.
Remove the previous hack that tried to work around the symptoms of
this issue.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>