Variable-length array compilation failure under -Werror

[MichaelChirico]

These declarations trigger the vla warning:

data.table/src/fsort.c

Line 128 in 1b32463

double mins[nBatch], maxs[nBatch];

See also https://stackoverflow.com/questions/61825661/why-does-clang-complain-about-using-variable-length-arrays-with-std-c99-flag