Port mod-test to --enable-gcc-warnings

* test/data/emacs-module/mod-test.c (NDEBUG): Undef, to prevent
GCC from complaining “error: unused variable ‘dummy’” and failing
to build the test, if --enable-gcc-warnings.
1 job for master in 69 minutes and 11 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
failed #1670
test-all

01:09:11

 
Name Stage Failure
failed
test-all Test
Makefile:318: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:293: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:957: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1