Consider STRINGPOINT as string_options

URL changed from being an OBJECT to being a STRINGPOINT so when building
URL was being thrown as an invalid option. This resolves that but has
left me with a segfault :-/

src/generate_curl_options_list.sh

@@ -30,7 +30,7 @@ generate() {
   ) > $root/$name.h
 }
 generate integer_options 'CINIT\((\w+).*LONG' OPT
-generate string_options  'CINIT\((\w+).*OBJECT' OPT
+generate string_options  'CINIT\((\w+).*(STRINGPOINT|OBJECT)' OPT
 
 generate integer_infos 'CURLINFO_(\w+).*LONG' INFO
 generate string_infos 'CURLINFO_(\w+).*STRING' INFO