murmurhash3 test failures on big-endian systems

[Apollon Oikonomopoulos]

Hi,

The dovecot 2.3.0.1 Debian package currently fails to build on all 
big-endian architectures[1], due to murmurhash3 tests failing. The 
relevant output from e.g. s390x is:

 test-murmurhash3.c:22: Assert(#8) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#11) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#12) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 murmurhash3 (murmurhash3_32) ......................................... : FAILED
 test-murmurhash3.c:22: Assert(#1) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#2) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#3) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#4) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#5) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#6) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#7) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#8) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#9) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#10) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#11) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#12) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 test-murmurhash3.c:22: Assert(#13) failed: memcmp(result, vectors[i].result, sizeof(result)) == 0
 murmurhash3 (murmurhash3_128) ........................................ : FAILED

Looks like the murmurhash3 implementation in Dovecot is currently broken on
big-endian systems.

Regards,
Apollon

[1] https://buildd.debian.org/status/package.php?p=dovecot&suite=experimental