Log Message:
Update onscripter to 20120901.

Change logs:

20120901:
 * add --render-font-outline option that enables outline fonts
   added in SDL_ttf 2.0.10

20120831:
 * fix resampling bug in resizeImage function enabled by
   -PDA_WIDTH or -DPDA_AUTOSIZE options

20120826:
 * fix a bug in getcursorpos2 insn after strsp insn
 * fix autosave bug if pretextgosub is not set