Add Memento build option to Android build. Fix memory leaks.

Following up on a report from a potential customer, fix various places
in mupdf.c where we were leaking memory (devices not freed, context
not properly freed etc).

In order to track this down, I added a Memento build - just do:

	ndk-build MEMENTO=1

when building. This only checks for leaks, not for memory overwrites
by default as it uses MEMENTO_LEAKONLY to avoid any possibility of the
android kernel killing stuff for being too slow or using too much
memory.

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