Remove the evil inline ==> rpcgen_inline CPP hack, rename the variable

Remove the evil inline ==> rpcgen_inline CPP hack, rename the variable
properly. Use ISO C prototyps. Remove useless void casts. Do some other
style updates. Remove !defined(__DragonFly__) cases, one was checking for
__Dragonfly__, which broke buildworld with GCC 3.4. Add a break after
default: in switch statements, which is not portable and an error with
GCC 3.4 and later.