Eliminate unusable wcassert code in favor of plain old C asssert.

Eliminate unusable wcassert code in favor of plain old C asssert.

The WC_* macros only expand to something meaningful when _DEBUG is
also defined. However, on enabling _DEBUG, bluedroid fails to build
because the wc_assert function is not defined anywhere. We can get
what I imagine is the equivalent behavior by switching over to the
standard C assert macro.