Some platforms now need contrib/tsm_system_time to be linked with libm.
Some platforms now need contrib/tsm_system_time to be linked with libm.

Buildfarm member hornet, at least, seems to want -lm in the link command.
Probably this is due to the just-added use of isnan().

zeroae/postgres-xl,zeroae/postgres-xl,zeroae/postgres-xl,zeroae/postgres-xl,zeroae/postgres-xl