* configure.ac: Check for Valgrind and sanitizers being mutually exclusive
- Valgrind and Address Sanitizer are mutually exclusive
- Valgrind and Memory Sanitizer are mutually exclusive
- Valgrind and Thread Sanitizer are mutually exclusive
./configure --enable-valgrind-tests --enable-fsanitize-ubsan && make check
though takes a little bit more time than usual it works as expected passing all tests successfully.