Changed multi-line C comments into another style.

The left side doesn't look unbalanced.

src/common/filepos.h

@@ -68,9 +68,9 @@ void InitFilePos (FilePos* P);
 
 int CompareFilePos (const FilePos* P1, const FilePos* P2);
 /* Compare two file positions. Return zero if both are equal, return a value
- * > 0 if P1 is greater and P2, and a value < 0 if P1 is less than P2. The
- * compare rates file index over line over column.
- */
+** > 0 if P1 is greater and P2, and a value < 0 if P1 is less than P2. The
+** compare rates file index over line over column.
+*/