Add missing libraries for sanitizer runtimes.

Sanitizer runtimes need libc++abi at linking time and libc++abi is statically
linked into libc++. We need add libc++ to `*_DYNAMIC_LIBS` manually so that
linker can find them.

Test: build.py
Change-Id: If78d51f399b583b3b279f2201b9294c50c3087aa