unix: add Unmount syscall for AIX

Change-Id: I86f33df28b844746617a47b01fb888f4b434564a
Reviewed-on: https://go-review.googlesource.com/c/sys/+/172897
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/unix/zsyscall_aix_ppc64_gccgo.go b/unix/zsyscall_aix_ppc64_gccgo.go
index 1b5d567..e5c4cbd 100644
--- a/unix/zsyscall_aix_ppc64_gccgo.go
+++ b/unix/zsyscall_aix_ppc64_gccgo.go
@@ -121,6 +121,7 @@
 int time(uintptr_t);
 int utime(uintptr_t, uintptr_t);
 unsigned long long getsystemcfg(int);
+int umount(uintptr_t);
 int getrlimit(int, uintptr_t);
 int setrlimit(int, uintptr_t);
 long long lseek(int, long long, int);
@@ -1030,6 +1031,14 @@
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func callumount(_p0 uintptr) (r1 uintptr, e1 Errno) {
+	r1 = uintptr(C.umount(C.uintptr_t(_p0)))
+	e1 = syscall.GetErrno()
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func callgetrlimit(resource int, rlim uintptr) (r1 uintptr, e1 Errno) {
 	r1 = uintptr(C.getrlimit(C.int(resource), C.uintptr_t(rlim)))
 	e1 = syscall.GetErrno()