Remove old comment

libc/sysdeps/linux/x86_64/sigaction.c

@@ -43,8 +43,6 @@ libc_hidden_proto(memcpy)
 
 /* If ACT is not NULL, change the action for SIG to *ACT.
    If OACT is not NULL, put the old action for SIG in *OACT.  */
-/* psm: couldn't use __sigaction, if building w/ disabled hidden,
- *      it will conflict w/ the one in libpthread */
 int
 __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
 {