src/common/inttypes.h is a shim to fix building cc65 on
non-C99-compliant compilers missing inttypes.h (like VS2012 and
earlier). The shim is actually incomplete and does not define the PRI...
macros supplied by the actual compiler headers. Since we're planning to
use those macros, delete this header so cc65's source files instead use
host-supplied inttypes.h containing macro definitions.
- tmpfile() tries to create files in the C: root dir on Windows where users usually don't have access.
- tmpnam() uses the curent dir which doesn't seem to be a good idea either.
- tempnam(NULL,NULL) is supposed to be cleverer.
