stderr does not have hidden version anymore, disable it's use

libc/unistd/getopt-susv3.c

@@ -37,7 +37,6 @@
 
 libc_hidden_proto(fprintf)
 libc_hidden_proto(strchr)
-libc_hidden_proto(stderr)
 
 #ifdef __UCLIBC_MJN3_ONLY__
 #warning TODO: Enable gettext awareness.