ext/neon/gstneonhttpsrc.c: Clean up the debug logging code and #ifdef mess a bit...

ext/neon/gstneonhttpsrc.c: Clean up the debug logging code and #ifdef mess a bit: whether or not gstreamer debug mess...

Original commit message from CVS:
* ext/neon/gstneonhttpsrc.c: (gst_neonhttp_src_start),
(gst_neonhttp_src_send_request_and_redirect):
Clean up the debug logging code and #ifdef mess a bit: whether or not
gstreamer debug messages should be output should not depend on an
element property; also, GST_ELEMENT_ERROR will leave a line in the log
already, so merge the more useful debug log messages with the less useful
error debug strings.