Changed multi-line C comments into another style.

The left side doesn't look unbalanced.

src/sp65/vic2sprite.c

@@ -92,9 +92,9 @@ static enum Mode GetMode (const Collection* A)
 
 StrBuf* GenVic2Sprite (const Bitmap* B, const Collection* A)
 /* Generate binary output in VICII sprite format for the bitmap B. The output
- * is stored in a string buffer (which is actually a dynamic char array) and
- * returned.
- */
+** is stored in a string buffer (which is actually a dynamic char array) and
+** returned.
+*/
 {
     enum Mode M;
     StrBuf* D;