Changed multi-line C comments into another style.

The left side doesn't look unbalanced.

src/sp65/main.c

@@ -107,8 +107,8 @@ static void Usage (void)
 
 static void SetWorkBitmap (Bitmap* N)
 /* Delete an old working bitmap and set a new one. The new one may be NULL
- * to clear it.
- */
+** to clear it.
+*/
 {
     /* If we have a distinct work bitmap, delete it */
     if (C != 0 && C != B) {
@@ -123,8 +123,8 @@ static void SetWorkBitmap (Bitmap* N)
 
 static void SetOutputData (StrBuf* N)
 /* Delete the old output data and replace it by the given one. The new one
- * may be NULL to clear it.
- */
+** may be NULL to clear it.
+*/
 {
     /* Delete the old output data */
     if (D != 0) {