curl: use --with-openssl instead of deprecated --with-ssl

with-ssl was deprecated in 7bdec2a08bf025d2f66c168111d47df6b21890d9

Author: chouquette

config/software/curl.rb

@@ -50,7 +50,7 @@
            "--without-gnutls",
            "--without-librtmp",
            "--without-libssh2",
-           "--with-ssl",
+           "--with-openssl",
            "--with-zlib",
            "--with-nghttp2",
   ]