Changed multi-line C comments into another style.

The left side doesn't look unbalanced.

src/ca65/anonname.h

@@ -51,9 +51,9 @@
 
 StrBuf* AnonName (StrBuf* Buf, const char* Spec);
 /* Get a name for an anonymous scope, variable or type. Size is the size of
- * the buffer passed to the function, Spec will be used as part of the
- * identifier if given. A pointer to the buffer is returned.
- */
+** the buffer passed to the function, Spec will be used as part of the
+** identifier if given. A pointer to the buffer is returned.
+*/
 
 int IsAnonName (const StrBuf* Name);
 /* Check if the given symbol name is that of an anonymous symbol */