* bytecode.c, callint.c, callproc.c: Use bool for boolean.

* bytecode.c, callint.c, callproc.c: Use bool for boolean.

* bytecode.c (exec_byte_code):
* callint.c (check_mark, Fcall_interactively):
* callproc.c (Fcall_process, add_env, child_setup, getenv_internal_1)
(getenv_internal, sync_process_alive, call_process_exited):
* lisp.h (USE_SAFE_ALLOCA):
Use bool for booleans, instead of int.
* lisp.h, process.h: Adjust prototypes to match above changes.
* callint.c (Fcall_interactively): Don't assume the mark's
offset fits in 'int'.