win32: implement getppid(2)

busybox-w32 had a dummy implementation of getppid(2) which always
returned 1.  Provide a more realistic version.

The effect is limited:

- The PPID shell variable should report a sensible value.

- The special value to omit the parent PID 'pidof -o %PPID'
  should work.

Costs 48 bytes.

1 files changed, 1 insertions, 1 deletions

diff --git a/include/mingw.h b/include/mingw.h
index 56a7285e5..2a6cae4ee 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -477,7 +477,7 @@ int getuid(void);
 #define geteuid getuid
 #define getegid getuid
 int getgroups(int n, gid_t *groups);
-IMPL(getppid,int,1,void);
+pid_t getppid(void);
 NOIMPL(getsid,pid_t pid UNUSED_PARAM);
 int getlogin_r(char *buf, size_t len);
 int fcntl(int fd, int cmd, ...);