Remove unused BASIC CaptureAssertions functionality

...that had originally been introduced to catch DBG_ASSERTs during smoketest,
but since made effectively unused when basing DBG_ASSERT on the sal/log.hxx
functionality, and obsoleted by the ongoing clean-up of using true assert where
appliable.

Change-Id: I2fb4f5d0873d29595b178057f83c1404c0085575