[translation] add a missing cast when an integer is used in a floating point/real context (was revealed by a Value's change, and now reveals a bug with == over reals)

[tests] update oracles according to various recent kernel changes

 - fix indentation
 - follow the model of must_init, build_initializer
 - only generated code if generate is set,
 - generate code "on project".
 - rename mainargs.i -> mainargs.c