Add new fields to EmscriptenFullscreenChangeEvent structure that report the new pixel sizes of the fullscreen element, as well as the whole screen size. These can be used to read and adjust the rendering canvas size appropriately when transitioning between fullscreen modes. Thanks to Joel Croteau for the suggestion at https://groups.google.com/forum/#!topic/emscripten-discuss/qaTrOXWv1Oc .
Bump version to 1.12.3 to update the cache after change to struct_info.json.
use le32 target when fastcomp is disabled, so we do not need a fastcomp build, and also fixes sqlite test
Merge branch 'fs_element_size' of https://github.com/juj/emscripten into incoming

This pulls a new feature from juj to provide the screen size when setting full screen.
fix test_fuzz in non-fastcomp
fix test_asmjs_unknown_emscripten
Merge branch 'incoming' of https://github.com/kripken/emscripten into incoming