Add Mpeg4H263DecoderTest to mts test_suite

Also add compile_multilib as mts build requires that

Bug: 183561217
Test: mts mts-media -m Mpeg4H263DecoderTest
Test: atest Mpeg4H263DecoderTest -- \
 --enable-module-dynamic-download=true

Change-Id: Iee84b22e262772ecc8efedf086bda1a025010790