Remove GCC7.1 arithmetic overflow fixup

This removes pragmas and the controlling code that quelled warnings
generated by GCC7.1 (only) with -Wstrict-overflow=3 and possibly other
levels.  Tested with GCC13.2, GCC7.1 is no longer the current version of
GCC7 (GCC7.5) and GCC7.1 was replaced by GCC7.2 on August 14, 2017.

Signed-off-by: John Bowler <jbowler@acm.org>
1 file changed