patch 9.0.1544: recent glibc marks sigset() as a deprecated
Problem: Recent glibc marks sigset() as a deprecated.
Solution: Use sigaction() in mch_signal() if possible. (Ozaki Kiichi,
closes #12373)
diff --git a/src/vim.h b/src/vim.h
index 8d0f3e0..6533a45 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -242,6 +242,9 @@
#if (defined(UNIX) || defined(VMS)) \
&& (!defined(MACOS_X) || defined(HAVE_CONFIG_H))
# include "os_unix.h" // bring lots of system header files
+#else
+ // For all non-Unix systems: use old-fashioned signal().
+# define mch_signal(signum, sighandler) signal(signum, sighandler)
#endif
// Mark unused function arguments with UNUSED, so that gcc -Wunused-parameter