win32: return correct exit status from waitpid

The exit status from _cwait wasn't being correctly returned.  This
resulted, for example, in the exit status of xargs being incorrect.
Running this:

   $ ls | xargs ls

in a directory containing filenames with spaces should cause 'ls' to
fail and 'xargs' to return an exit status of 123.

1 files changed, 5 insertions, 1 deletions

diff --git a/win32/process.c b/win32/process.c
index de8f653c5..d6176ca23 100644
--- a/win32/process.c
+++ b/win32/process.c
@@ -12,7 +12,11 @@ int waitpid(pid_t pid, int *status, int options)
                                                 FALSE, pid)) != NULL ) {
                         ret = _cwait(status, (intptr_t)proc, 0);
                         CloseHandle(proc);
-                        return ret == -1 ? -1 : pid;
+                        if (ret == -1) {
+                                return -1;
+                        }
+                        *status <<= 8;
+                        return pid;
                 }
         }
         errno = pid < 0 ? ENOSYS : EINVAL;