Include common-exceptions.h in common-defs.h

This commit includes common-exceptions.h in common-defs.h and removes
all other inclusions.

gdb/ChangeLog:

	* common/common-defs.h: Include common-exceptions.h.
	* exceptions.h: Do not include common-exceptions.h.

gdb/gdbserver/ChangeLog:

	* server.h: Do not include common-exceptions.h.

gdb/gdbserver/server.h

@@ -124,6 +124,4 @@ extern int handle_target_event (int err, gdb_client_data client_data);
    as large as the largest register set supported by gdbserver.  */
 #define PBUFSIZ 16384
 
-#include "common-exceptions.h"
-
 #endif /* SERVER_H */