Revert "Add operator char * to the naked array types as well"

This reverts commit db889c18.

Was resulting in ambigious overloads...

src/hb-dsalgs.hh

@@ -555,8 +555,6 @@ struct hb_array_t
 
   template <typename T> inline operator  T * (void) { return arrayZ; }
   template <typename T> inline operator const T * (void) const { return arrayZ; }
-  inline operator char * (void) { return (char *) arrayZ; }
-  inline operator const char * (void) const { return (const char *) arrayZ; }
 
   inline Type * operator & (void) { return arrayZ; }
   inline const Type * operator & (void) const { return arrayZ; }

src/hb-open-type.hh

@@ -342,8 +342,6 @@ struct UnsizedArrayOf
 
   template <typename T> inline operator T * (void) { return arrayZ; }
   template <typename T> inline operator const T * (void) const { return arrayZ; }
-  inline operator char * (void) { return (char *) arrayZ; }
-  inline operator const char * (void) const { return (const char *) arrayZ; }
 
   inline unsigned int get_size (unsigned int len) const
   { return len * Type::static_size; }