nitg/pnacl: automate option no_main

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
pnacl: disable clang warnings on generated code

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
pnacl: generate all files right in .nit_compile

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
pnacl: compile each compilation unit before linking

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
example/pnacl: remove copiler args that are no more necessary

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
examples/pnacl: add server option to Makefile

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
tests: add example converter to tests (and not pnacl)

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>