[PATCH 2/2] Adjust testcases for C++17 compatibility

[Jonathan Wakely]

Adding TR1 and LFTS components to namespace std makes some tests fail
due to ambiguous names. This resolves those problems so the tests pass
using C++17.

    Adjust testcases for C++17 compatibility
    
    	* testsuite/26_numerics/headers/cmath/types_std_c++0x_neg.cc: Disable
    	test for C++17.
    	* testsuite/experimental/chrono/value.cc: Avoid ambiguities in C++17.
    	* testsuite/experimental/ratio/value.cc: Likewise.
    	* testsuite/ext/pb_ds/regression/hash_map_rand.cc: Disable test for
    	C++17.
    	* testsuite/ext/pb_ds/regression/hash_set_rand.cc: Likewise.
    	* testsuite/ext/pb_ds/regression/list_update_map_rand.cc: Likewise.
    	* testsuite/ext/pb_ds/regression/list_update_set_rand.cc: Likewise.
    	* testsuite/ext/pb_ds/regression/priority_queue_rand.cc: Likewise.
    	* testsuite/ext/pb_ds/regression/tree_map_rand.cc: Likewise.
    	* testsuite/ext/pb_ds/regression/tree_set_rand.cc: Likewise.
    	* testsuite/ext/pb_ds/regression/trie_map_rand.cc: Likewise.
    	* testsuite/ext/pb_ds/regression/trie_set_rand.cc: Likewise.
    	* testsuite/tr1/5_numerical_facilities/special_functions/
    	10_cyl_bessel_k/airy.cc: Adjust namespace of __detail::__airy for
    	C++17 compatibility.

Tested powerpc64le-linux, committed to trunk.


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