Fix "make tags": set locale to C to call sort
vim expects that the tags file is sorted using english collation, so it fails
if the locale is french for example. Use LC_ALL=C to force english sorting
order. Issue #27726.
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 2101e70..105481a 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1566,7 +1566,7 @@
ctags -w Include/*.h; \
for i in $(SRCDIRS); do ctags -w -a $$i/*.[ch]; \
done; \
- sort -o tags tags
+ LC_ALL=C sort -o tags tags
# Create a tags file for GNU Emacs
TAGS::