* remote.c (remote_wait): Fix cast on signal() call.

	* remote.c (remote_wait):  Fix cast on signal() call.
	* defs.h (alloca):  More diddling with alloca.  Have to ensure
	that it has a prototype, so that if alloca is defined as a macro
	that takes an arg, the definition is seen as a use of a macro
	that takes an arg, to satisfy picky ANSI preprocessors.