Bug#961011: g++-9: internal compiler error: in asan_expand_mark_ifn, at asan.c:3194

[Michael R. Crusoe]

We worked around this by removing the use of `goto` within the OpenMP
loop:
https://github.com/soedinglab/MMseqs2/pull/309/commits/a5b2f230bb6fb3ab79bed626d2f89d59e1a5b2df

However, a non-crash error message would be appreciated.