libc: add goos, goarch, goroot. fixes build

TBR=r
CC=golang-dev
https://golang.org/cl/190059

diff --git a/include/libc.h b/include/libc.h
index 7b86399feea66aeac530645bc6d18f40ce6f750d..7774f98fa171c200ce2940667e624c36a0e67553 100644 (file)
--- a/include/libc.h
+++ b/include/libc.h
@@ -286,6 +286,10 @@ extern     Waitmsg*        waitnohang(void);
 extern int     p9waitpid(void);
 extern ulong   rendezvous(ulong, ulong);
 
+extern char*   getgoos(void);
+extern char*   getgoarch(void);
+extern char*   getgoroot(void);
+
 #ifdef __MINGW32__
 extern int fork();
 extern int pread(int fd, void *buf, int n, int off);