Remove superfluous semicolon

[roystgnr]

Not sure why we don't have more recipes screaming about this, but at least a few of the devel->master recipe compilers caught it.

[jwpeterson]

If you want to merge this before all the PR testing finishes, I'm fine with it.

[roystgnr]

The only difference between the passing-on-devel "Min gcc" and the failing-on-devel "Min gcc debug" is opt vs dbg builds ... and there the difference is that opt doesn't set -pedantic (or -W -Wall -Wextra -Wno-long-long -Wunused -Wpointer-arith -Wformat -Wparentheses -Woverloaded-virtual ...)

Any objections to us starting to turn on all warnings on all build levels? IMHO opt should entail skipping internal checks that might slow us down at runtime, but not warnings at compile time. This obviously isn't urgent to fix, but I might just change it in ACSM and then we'll pick it up whenever we next update that for something more pressing.

[jwpeterson]

Hmm... I guess I don't know why opt and dbg mode warning flags should be different, other than we have just done that historically. So I guess I'd be fine with making warning flags the same for all optimization levels.

[roystgnr]

This passed at least one of the previously failing recipes; not going to wait on everything.