Changed multi-line C comments into another style.

The left side doesn't look unbalanced.

src/sp65/input.c

@@ -87,9 +87,9 @@ static const FileId FormatTable[] = {
 
 Bitmap* ReadInputFile (const Collection* A)
 /* Read a bitmap from a file and return it. Format, file name etc. must be
- * given as attributes in A. If no format is given, the function tries to
- * autodetect it by using the extension of the file name.
- */
+** given as attributes in A. If no format is given, the function tries to
+** autodetect it by using the extension of the file name.
+*/
 {
     const FileId* F;