Use LOCAL_CXX_STL to select libc++_static.

Directly adding the library to LOCAL_STATIC_LIBRARIES thwarts a few
build system checks.

Change-Id: Ib23c43badfa85de21c691f79ccdcc2cbe2a89b33
Merge "Use LOCAL_CXX_STL to select libc++_static."
Return total footprint, not high water mark.

The mallinfo usmblks value returned by dlmalloc is a little misleading.
It's not the current max, it's the historical high water mark. This
leads to dumpsys meminfo producing native memory numbers that don't add up.
Change this to the real total footprint, not this high water mark.

Bug: 17265653

(cherry pick from commit f4ada9c9ce31c7e56146a4cb703747385bc043a5)

Change-Id: I2fba10285859dccfe8331063c9be14cc169f2d91
Merge "Return total footprint, not high water mark."