work around impossibility to dlopen jemalloc 5 library Since version 5, jemalloc "cannot allocate memory in static TLS block" when loaded with dlopen(3). This also affects libraries linked against the libjemalloc, so this patch exposes a possible workaround for end users of python drmaa module when they get caught in such situation. Having to manually preload the library before starting the interpreter is somewhat ugly, but that's the only way which works for the moment.
