Previously test 104 used a combination of *nix tools and system() calls
to emulate a `sh` script, which required split code paths for windows
due to different shell and different absolute path representation.
Also, it used a hardcoded tcc binary path, didn't set locale for sort.
Now the tools are used from a `sh` script which the program generates
and invokes, tmp files are at CWD and no conversion is required, tcc
path is taken from Makefile (exported), and `sort` uses LC_ALL=C.
5dfcc7506c