Silence gcc7 warnings by adjusting FALLS THROUGH comment.

CHANGES

@@ -9,6 +9,8 @@
           sure how it is supposed to work.
         - Added 2.11BSD/m11 as test files. To make this reasonable, a
           few small features they use have been recognized and ignored.
+        - Add -rsx and -rt11 to switch object file format
+          (from Kevin Handy)
 
 09.11.2015: Rhialto
         version 0.4:

assemble.c

@@ -774,7 +774,7 @@ static int assemble(
                     opcp = skipwhite(opcp);
                     cp = opcp + 3;     /* Point cp at the "DF" or
                                           "NDF" part */
-                    /* Falls into... */
+                    /* FALLS THROUGH */
                 case P_IIF:
                 case P_IF:
                     {

assemble_aux.c

@@ -226,7 +226,7 @@ void implicit_gbl(
     case EX_AND:
     case EX_OR:
         implicit_gbl(value->data.child.right);
-        /* falls into... */
+        /* FALLS THROUGH */
     case EX_COM:
     case EX_NEG:
         implicit_gbl(value->data.child.left);