GS290: libshim_vtservice: Fixup vtservice shim

 * All non-static class member functions (including constructors/destructors) carry a hidden this pointer. Add it.

 * AttributionSourceState now holds the pid and
 uid, create a new AttributionSourceState and set the uid and pid and pass it
 to new AudioTrack constructor.

 * _ZN7android10MediaMuxerC1EiNS0_12OutputFormatE is a class constructor, so
 call the new equivalent.

 * Only build 32bit library, since vtservice is 32bit
 on pre A12 IMS stack, and size_t on 32bit is unsigned int, while on 64 bit it
 is unsigned long, meaning that we can't link the shim against the 32bit and
 64bit lib since the symbol changes (well, we could with a compiler macro to
 use the correct symbol name for the 2 libs, but as stated before, there is no
 point).

Signed-off-by: bengris32 <bengris32@protonmail.ch>
Change-Id: I275fac7ddf63595f482ebef80d2116a322b6db60