add missing newline to a bunch of files

test/ref/cc65070303.c

@@ -35,4 +35,4 @@ seems to work.
 
 greetings,
 <EFBFBD> <20>Andreas
-*/
+*/

test/ref/cc65080227.c

@@ -36,4 +36,4 @@ int main(void)
     000023r 1  A4 rr            ldy     sreg
     000025r 1  8C rr rr         sty     _b+2
     000028r 1  8C rr rr         sty     _b+3    ; lost 4th BYTE !
-*/
+*/

test/ref/cc65101209.c

@@ -35,4 +35,4 @@ So testing with 999 gives:
 999 mod 999 is 0
 
 This seems to be systematic. 
-*/
+*/

test/ref/cc65101216.c

@@ -24,4 +24,4 @@ int main()
     printf("a / b = %d", c);
 
     return 0;
-}
+}