gdb: cleanup includes in *-typeprint.[ch]

Remove includes reported as unused by clangd.

Include "gdb-hashtab.h" in typeprint.h for the use of "htab_up".

Change-Id: I5b04ec14e71800e2d6ad622838e39b7033e168cf

gdb/ada-typeprint.c

@@ -16,14 +16,12 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-#include "bfd.h"
 #include "event-top.h"
 #include "gdbtypes.h"
 #include "value.h"
 #include "c-lang.h"
 #include "cli/cli-style.h"
 #include "typeprint.h"
-#include "target-float.h"
 #include "ada-lang.h"
 #include <ctype.h>