curl: make warnings and other messages aware of terminal width

This removes unnecessary line wraps when the terminal is wider than 79
columns and it also makes messages look better in narrower terminals.

The get_terminal_columns() function is not split out into its own source
file.

Suggested-by: Elliott Balsley
Fixes #13804
Closes #13808

src/tool_help.c

@@ -31,6 +31,7 @@
 #include "tool_util.h"
 #include "tool_version.h"
 #include "tool_cb_prg.h"
+#include "terminal.h"
 
 #include "memdebug.h" /* keep this as LAST include */