Bug#793924: sfcgal: FTBFS on non-amd64: symbols not as expected

[Aaron M. Ucko]

Source: sfcgal
Version: 1.1.0-1
Severity: serious
Justification: fails to build from source

Builds of sfcgal for architectures other than amd64 have all failed
with symbol mismatches, as detailed at

https://buildd.debian.org/status/logs.php?pkg=sfcgal&ver=1.1.0-1

(It's possible that kfreebsd-amd64 would fare better.)

Could you please take a look, and account for this variation?

Thanks!