Fix some issues with fawzi's patch. - It now actually compiles: - import stdc.stdio for string formatting functions) - remove extra '{' - Use snprintf() instead of sprintf(). - Use return value from snprintf instead of strlen(). - Don't print the filename in Exception.writeOut() if it has zero length and the line number is 0 (It would previously only skip these if the filename was null, but not if it was a different empty string) - Ignore empty filename + line number 0 in FrameInfo.writeOut() as well.

[Environment]
DFLAGS=-I@RUNTIME_DIR@/import -L-L%@P%/../lib