runtime(c): Update signal constants in syntax script

Commit: 
https://github.com/vim/vim/commit/7fe4b8c1bd34e6bf108a7127903be9508809e17c
Author: Harry <[email protected]>
Date:   Tue Nov 18 20:50:39 2025 +0000

    runtime(c): Update signal constants in syntax script
    
    closes: https://github.com/vim/vim/issues/18763
    
    Co-authored-by: zeertzjq <[email protected]>
    Signed-off-by: Harry <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/syntax/c.vim b/runtime/syntax/c.vim
index 68b6778c7..d2f2b85b4 100644
--- a/runtime/syntax/c.vim
+++ b/runtime/syntax/c.vim
@@ -1,7 +1,7 @@
 " Vim syntax file
 " Language:            C
 " Maintainer:          The Vim Project <https://github.com/vim/vim>
-" Last Change:         2025 Jan 18
+" Last Change:         2025 Nov 18
 " Former Maintainer:   Bram Moolenaar <[email protected]>
 
 " Quit when a (custom) syntax file was already loaded
@@ -421,8 +421,10 @@ if !exists("c_no_ansi") || exists("c_ansi_constants") || 
exists("c_gnu")
   syn keyword cConstant NDEBUG
   " POSIX 2001
   syn keyword cConstant SIGBUS SIGPOLL SIGPROF SIGSYS SIGURG SIGVTALRM SIGXCPU 
SIGXFSZ
+  " POSIX Issue 8 (post 2017)
+  syn keyword cConstant SIGWINCH
   " non-POSIX signals
-  syn keyword cConstant SIGWINCH SIGINFO
+  syn keyword cConstant SIGINFO SIGIO
   " Add POSIX errors as well.  List comes from:
   " http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
   syn keyword cConstant E2BIG EACCES EADDRINUSE EADDRNOTAVAIL EAFNOSUPPORT 
EAGAIN EALREADY EBADF

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