Since _Bool is only ever a keyword and not a macro, and we can't
test for HAVE_STDBOOL_H in the headers, remove the #ifdef for it in
<cdio/types.h> and instead, simply define it as 'int'. Replace
inclusion of <stdbool.h> with <cdio/types.h> so that a consistent
definition of bool is used.
Signed-off-by: Natalia Portillo <claunia@claunia.com>