embedded: Allow to disable the line number bytecode

This is more noticable on smaller devices. Allow to disable the
line number bytecode. This changes the runtime of Bench.st for
4 iterations from 26s to 19s.

2013-05-18  Holger Hans Peter Freyther  <holger@freyther.de>

	* gst-tool.c: Add --no-line-numbers to the gst-remote command.
	* main.c: Add --no-line-numbers to the gst command.

2013-05-18  Holger Hans Peter Freyther  <holger@freyther.de>

	* libgst/byte.c: Define _gst_omit_line_numbers, emit line
	numbers depending on this variable.
	* libgst/files.h: Declare the _gst_omit_line_numbers variable.
	* libgst/gst.h: Introduce GST_NO_LINE_NUMBERS.
	* libgst/interp.c: Implement get and set of GST_NO_LINE_NUMBERS.