TiffEntry::getU32(): add explicit __builtin_unreachable().
TiffEntry::getU32(): add explicit __builtin_unreachable().

Too bad SonarQube has problems with seeing that
even though all the Throw*() macros already
contain such __builtin_unreachable()...

LebedevRI/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed