[vala/staging] posix: Add perror(3)

[Dr. Michael Lauer <mlauer src gnome org>]

commit c975dcb42a12e6c54c8b49ffcd774591edfcef00
Author: Dr. Michael Lauer <mickey vanille-media de>
Date:   Sun Mar 11 12:29:22 2018 +0100

    posix: Add perror(3)

 vapi/posix.vapi |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/vapi/posix.vapi b/vapi/posix.vapi
index 9e81da7..31d402d 100644
--- a/vapi/posix.vapi
+++ b/vapi/posix.vapi
@@ -2702,6 +2702,9 @@ namespace Posix {
        public static FILE stdout;
        public static FILE stdin;
 
+       [CCode (cheader_filename = "stdio.h")]
+       public void perror (string s);
+
        [CCode(cheader_filename = "sched.h", cprefix = "sched_")]
        namespace Sched {
                [SimpleType]