Fix minor issues withing curl bindings

vendor/curl/curl.odin

@@ -2502,7 +2502,7 @@ foreign lib {
 	 * Appends a string to a linked list. If no list exists, it will be created
 	 * first. Returns the new list, after appending.
 	 */
-	slist_append :: proc(list: ^slist, data: [^]byte) -> ^slist ---
+	slist_append :: proc(list: ^slist, data: cstring) -> ^slist ---
 
 	/*
 	 * NAME curl_slist_free_all()
@@ -2932,4 +2932,4 @@ foreign lib {
 	                         userptr: rawptr) -> code ---
 
 
-}
+}

vendor/curl/curl_multi.odin

@@ -410,7 +410,7 @@ foreign lib {
 	 *
 	 * Returns: NULL on failure, otherwise a CURL **array pointer
 	 */
-	multi_get_handles :: proc(multi_handle: ^CURLM) -> ^^CURL ---
+	multi_get_handles :: proc(multi_handle: ^CURLM) -> [^]^CURL ---
 
 	/*
 	 * Name:    curl_multi_get_offt()
@@ -482,4 +482,4 @@ foreign lib {
 	                      ufds: [^]waitfd,
 	                      size: c.uint,
 	                      fd_count: ^c.uint) -> Mcode ---
-}
+}