build-system/Android: use PREFIX outside of NDK

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>

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