Cygwin: tags: drop _EXFUN regex

_EXFUN has been removed a while back

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/Makefile.in

@@ -784,8 +784,6 @@ CTAGS:
 	-cd $(srcdir) && \
 	ctags -R --c++-kinds=+p --fields=+iaS --extra=+q \
 	--regex-C++='/EXPORT_ALIAS *\([a-zA-Z0-9_]*, *([a-zA-Z0-9_]*)\)/\1/' \
-	--regex-C++='/_EXFUN *\(([a-zA-Z0-9_]+) ?[,\)]/\1/' \
-	--regex-C++='/_EXFUN *\([^,]* ([a-zA-Z0-9_]+) ?[,\)]/\1/' \
 	--regex-C++='/__ASMNAME *\("([a-zA-Z0-9_]+)"\)/\1/' \
 	@newlib_headers@ .