signed, unsigned and straight char.
(padding_char, padding_short, padding_int, padding_long,
padding_long_long, padding_float, padding_double,
padding_long_double): New global variables.
(fill, fill_structs): New functions.
* gdb.base/sizeof.exp: Check for signed and unsigned char. Check
for correctly sized writes. Update copyright.
(get_valueof): New procedure.
(get_sizeof): Call get_valueof.
(check_valueof): New procedure.
(check_padding): New procedure.
