Merge r1523479 from trunk (but testpass is in APR-Util):

assert() games:

testmutexscope relies on assert() to check as well as to run at all,
so make sure NDEBUG isn't defined.

testpass and teststr don't use assert(), so don't include <assert.h>.



git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.5.x@1531104 13f79535-47bb-0310-9956-ffa450edef68