Adjust various functions to prototype style which are defined under
NO_CANCELLATION conditionals.

Upstream, the function definitions were removed in:

commit c6bb095eb544aa32d3f4b8e9aa434d686915446e
Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date:   Sun Sep 28 08:46:23 2014 -0300

    nptl: Rewrite cancellation macros

diff --git a/sysdeps/unix/sysv/linux/sigsuspend.c b/sysdeps/unix/sysv/linux/sigsuspend.c
index 1cd1de88d303fd66..e5ae86382bc74c7d 100644
--- a/sysdeps/unix/sysv/linux/sigsuspend.c
+++ b/sysdeps/unix/sysv/linux/sigsuspend.c
@@ -53,8 +53,7 @@ strong_alias (__sigsuspend, __libc_sigsuspend)
 
 #ifndef NO_CANCELLATION
 int
-__sigsuspend_nocancel (set)
-     const sigset_t *set;
+__sigsuspend_nocancel (const sigset_t *set)
 {
   return do_sigsuspend (set);
 }