Revert "Makefile: Detect which address sanitizer option to use for clang...

... debug builds"

This reverts commit 6ea9b11b4bd8bcbf8d4c5027da2c1f5f1e8fc799.
The changes just weren't good enough.
They caused build errors for macosx-x86-64-clang-debug and most likely
for some clang debug linux builds.

That'r why the revert as a temporary fix