ipc.h - IPC defined as functions again

- CHOOSETRAP define makes impossible to use some common words
  like send, receive and notify in any other context, for
  instance as members or structures

- any reasonable compiler inlines the static inline functions so
  no extra function call overhead is introduced by this change

- this gets us back to the situation before the SYSCALL/SYSENTER
  change. It is not perfect, but it used to work and still does.

servers/procfs/root.c

@@ -185,7 +185,7 @@ static void root_ipcvecs(void)
 	 * to distinguish them from regular symbols.
 	 */
 #define PRINT_ENTRYPOINT(name) \
-	buf_printf("%08lx T %s(k)\n", _minix_ipcvecs.name ## _ptr, #name)
+	buf_printf("%08lx T %s(k)\n", _minix_ipcvecs.name, #name)
 
 	PRINT_ENTRYPOINT(sendrec);
 	PRINT_ENTRYPOINT(send);