Changed multi-line C comments into another style.

The left side doesn't look unbalanced.

src/sp65/c.c

@@ -157,9 +157,9 @@ void WriteCFile (const StrBuf* Data, const Collection* A, const Bitmap* B)
     /* Write a readable header */
     fprintf (F,
              "/*\n"
-             " * This file was generated by %s %s from\n"
-             " * %.*s (%ux%u, %u colors%s)\n"
-             " */\n"
+             "** This file was generated by %s %s from\n"
+             "** %.*s (%ux%u, %u colors%s)\n"
+             "*/\n"
              "\n",
              ProgName,
              GetVersionAsString (),
@@ -169,8 +169,8 @@ void WriteCFile (const StrBuf* Data, const Collection* A, const Bitmap* B)
              BitmapIsIndexed (B)? ", indexed" : "");
 
     /* If an identifier was given, output #defines for width, height, the
-     * number of colors and declare a variable for the data.
-     */
+    ** number of colors and declare a variable for the data.
+    */
     if (Ident) {
         fprintf (F,
                  "#define %s_COLORS       %u\n"