Changed multi-line C comments into another style.

The left side doesn't look unbalanced.

src/ld65/objdata.h

@@ -111,30 +111,30 @@ ObjData* NewObjData (void);
 
 void FreeObjData (ObjData* O);
 /* Free an ObjData object. NOTE: This function works only for unused object
- * data, that is, ObjData objects that aren't used because they aren't
- * referenced.
- */
+** data, that is, ObjData objects that aren't used because they aren't
+** referenced.
+*/
 
 void FreeObjStrings (ObjData* O);
 /* Free the module string data. Used once the object file is loaded completely
- * when all strings are converted to global strings.
- */
+** when all strings are converted to global strings.
+*/
 
 void InsertObjData (ObjData* O);
 /* Insert the ObjData object into the collection of used ObjData objects. */
 
 void InsertObjGlobals (ObjData* O);
 /* Insert imports and exports from the object file into the global import and
- * export lists.
- */
+** export lists.
+*/
 
 unsigned MakeGlobalStringId (const ObjData* O, unsigned Index);
 /* Convert a local string id into a global one and return it. */
 
 const char* GetObjFileName (const ObjData* O);
 /* Get the name of the object file. Return "[linker generated]" if the object
- * file is NULL.
- */
+** file is NULL.
+*/
 
 #if defined(HAVE_INLINE)
 INLINE int ObjHasFiles (const ObjData* O)