CMake: enable WITH_ASSERT_ABORT by default

Assert from BLI_assert by default in debug builds
(instead of just printing a warning).

Some developers ignored this, causing errors for others.
Better debug builds cause hard error so code isn't ignored.

Disabling is still useful when bisecting or testing outdated code.

CMakeLists.txt

@@ -444,7 +444,7 @@ mark_as_advanced(WITH_MEM_VALGRIND)
 option(WITH_CXX_GUARDEDALLOC "Enable GuardedAlloc for C++ memory allocation tracking (only enable for development)" OFF)
 mark_as_advanced(WITH_CXX_GUARDEDALLOC)
 
-option(WITH_ASSERT_ABORT "Call abort() when raising an assertion through BLI_assert()" OFF)
+option(WITH_ASSERT_ABORT "Call abort() when raising an assertion through BLI_assert()" ON)
 mark_as_advanced(WITH_ASSERT_ABORT)
 
 option(WITH_BOOST					"Enable features depending on boost" ON)