arch/z80/src/Makefile: Correct inclusion of non-existent file. This was not a problem before because there was '-' before the include. Problem revealed with '-' removed.
arch/z80/src/ez80/Toolchain.defs: Apparently there are not too many '"' in path definition.
tools/incdir.c: No space between -usrinc: or -sysinc: and the list of paths.
1. If config.c is compiled on any platform other than Cygwin, then the variable wintools is not used.
2. Add more debug output so we can see what is going on in the PR checks.
Xiang Xiao