Fixed some compile warnings and errors and improved portability in the

examples.
Removed ftp3rdparty.c since libcurl doesn't support 3rd party FTP transfers
any longer.

docs/examples/cacertinmem.c

@@ -135,4 +135,5 @@ int main(void)
 
   curl_easy_cleanup(ch);
   curl_global_cleanup();
+  return rv;
 }