lang/gnu-apl: unbreak the build on recent -CURRENT (clang 13.0.0)
Bif_F12_FORMAT.cc:579:5: error: variable 'sum' set but not used [-Werror,-Wunused-but-set-variable] int sum = 0; ^ 1 error generated.
Obtained from: upstream SVN r1498
Reported by: pkg-fallout