MinGW: simplify waitpid() emulation macros
MinGW: simplify waitpid() emulation macros

Windows does not have signals. At least they cannot be diagnosed by the
parent process; all that the parent process can observe is the exit code.

This also adds a dummy definition of WTERMSIG.

Signed-off-by: Johannes Sixt <fd432345609ae4d58c1aa629cb66ba96d1391622@kdbg.org>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git