libstdc++: Remove useless base classes in pb_db tests

libstdc++: Remove useless base classes in pb_db tests

These function objects do not need to be adaptable, so stop deriving
from deprecated classes. Also the 'inline' keyword is redundant on
member functions defined in the class body.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:

	* testsuite/ext/pb_ds/example/basic_multimap.cc: Remove
	unnecesary derivation from std::unary_function.
	* testsuite/ext/pb_ds/example/erase_if.cc: Likewise.
	* testsuite/ext/pb_ds/example/hash_illegal_resize.cc: Likewise.
	* testsuite/ext/pb_ds/example/hash_initial_size.cc: Likewise.
	* testsuite/ext/pb_ds/example/hash_load_set_change.cc: Likewise.
	* testsuite/ext/pb_ds/example/hash_mod.cc: Likewise.
	* testsuite/ext/pb_ds/example/hash_resize.cc: Likewise.
	* testsuite/ext/pb_ds/example/hash_shift_mask.cc: Likewise.
	* testsuite/ext/pb_ds/example/priority_queue_dijkstra.cc:
	Likewise.
	* testsuite/ext/pb_ds/example/ranged_hash.cc: Likewise.
	* testsuite/ext/pb_ds/example/store_hash.cc: Likewise.