Allow -fsanitize for LLVM as well as for GCC.

 * renamed --with-llvm-sanitizer to --with-sanitizer
 * disable all optimisations (-O0) if --with-sanitizer set,
   no functions/paramaters/variables will be optimised, improves debugging
 * enable undefined behaviour sanitizer (ubsan)
 * enable leak sanitizer (lsan)
 * check if -fsanitize=fuzzer is available and --enable-fuzztargets set,
   fail if not (only supported by clang)
 * include level 3 debugging information (-g3), improves macro debugging
 * disabled ubsan misaligned pointer access and lshift overflow

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

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