Fix linkage of grantpt(3).

Also clean up the implementation of all the pty functions, add tests,
and fix the stub implementations of ttyname(3) and ttyname_r(3).

Bug: https://code.google.com/p/android/issues/detail?id=58888
Change-Id: I0fb36438cd1abf8d4e87c29415f03db9ba13c3c2
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 12e6257..82c53e8 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -170,7 +170,7 @@
 extern int optind, opterr, optopt;
 
 extern int isatty(int);
-extern char* ttyname(int);
+extern char* ttyname(int) __warnattr("ttyname is not thread-safe; use ttyname_r instead");
 extern int ttyname_r(int, char*, size_t);
 
 extern int  acct(const char*  filepath);