[newlib-cygwin] Cygwin: document sig2str and str2sig in version.h

[Ken Brown]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=65d68186614ecb0446febf2efb3025ee2578cc97

commit 65d68186614ecb0446febf2efb3025ee2578cc97
Author: Ken Brown <kbrown@cornell.edu>
Date:   Fri Oct 22 13:56:05 2021 -0400

    Cygwin: document sig2str and str2sig in version.h

Diff:
---
 winsup/cygwin/include/cygwin/version.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/include/cygwin/version.h b/winsup/cygwin/include/cygwin/version.h
index 558ac0c3f..170c51769 100644
--- a/winsup/cygwin/include/cygwin/version.h
+++ b/winsup/cygwin/include/cygwin/version.h
@@ -514,7 +514,8 @@ details. */
   340: Export dbm_clearerr, dbm_close, dbm_delete, dbm_dirfno, dbm_error,
        dbm_fetch, dbm_firstkey, dbm_nextkey, dbm_open, dbm_store.
   341: Export pthread_cond_clockwait, pthread_mutex_clocklock,
-       pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock, sem_clockwait.
+       pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock,
+       sem_clockwait, sig2str, str2sig.
 
   Note that we forgot to bump the api for ualarm, strtoll, strtoull,
   sigaltstack, sethostname. */