fix some "\n"-related stuff

add missing "\n"s to some Printf()-like calls (in Rend2)
drop erroneous "\n"s from some Error()-like calls (in Rend2)
drop erroneous "\n" from a Com_Error() call (in vm_sparc.c)

code/qcommon/vm_sparc.c

@@ -701,7 +701,7 @@ static void dst_insn_append(struct func_info * const fp)
 
 static void ErrJump(void)
 { 
-	Com_Error(ERR_DROP, "program tried to execute code outside VM\n");
+	Com_Error(ERR_DROP, "program tried to execute code outside VM");
 	exit(1);
 }