Move codec and extractor to libc_scudo.

The mediaswcodec and mediaextractor use the scudo libraries as a
sanitizer. This has some downsides since it bypasses all of the normal
allocation handlers used by the rest of the system.

Switching from the plain sanitizer to a wrapper library libc_scudo.so
allows the use of the allocation handler code from
bionic/libc/bionic/malloc_common.cpp.

This is a temporary workaround, later versions of Android should
support scudo as a first class native allocator.

NOTE: The two libraries that make up the scudo override combined are
smaller than the libclang_rt.scudo-XXX.so library, so this is a space
win too.

Bug: 123689570

Test: Builds and boots. Verified that scudo is used as the allocator.
Test: Verified that the allocation limit is properly set for mediaextractor.
Test: Ran a few of the CtsMediaTestCases tests.

Change-Id: I3bdf76bfeea503b33da765e093e38818b620a481