Add log and log10 to available XPath functions

FB145889
1.3 solution is to wrap in a preprocessor and then throw an exception saying that function is unavailable in the preprocessed section.

Yeah, you can check the CLDC and MIDP device profile specs (CLDC 2.0, MIDP 1.1 JavaDoc is the best google search term) to see if it's not there, or you can run a j2me build if you have polish installed just to see if it crashes.