* defs.h: Reword confusing comment about ANSI prototypes.
* defs.h: Some minor whitespace changes.
* infrun.c (wait_for_inferior): Compare int tmp to int 0,
not NULL, which can be (void *).
* tm-amix.h, tm-i386v4.h: Add defines for setjmp/longjmp handling.
* tm-i386v.h (SP_ARG0): Define
* xm-sysv4.h: Back out of change for missing prototypes.
* i386-tdep.c (get_longjmp_target): Add function.
Change svr4 references to sysv4.
* source.c: Move declaration of external function index to
front of file so it is in scope for all references.
* utils.c (error, fatal): Make definitions consistent with
defs.h declarations (declared as "volatile void").