* config/abi/pre/gnu.ver: Remove
	_ZNKSt3tr14hashIgEclEg@@GLIBCXX_3.4.10 and
	_ZNKSt4hashIgEclEg@@GLIBCXX_3.4.10 export.
	* config/os/gnu-linux/ldbl-extra.ver: Export
	_ZNKSt3tr14hashIgEclEg@@GLIBCXX_LDBL_3.4.10
	and _ZNKSt4hashIgEclEg@@GLIBCXX_LDBL_3.4.10.
	* src/hash.cc: Only define long double hash specialization if
	_GLIBCXX_LONG_DOUBLE_COMPAT_IMPL is defined.
	* src/compatibility-ldbl.cc: Include "hash.cc".
	(_GLIBCXX_LONG_DOUBLE_COMPAT_IMPL): Define.
	(_ZNKSt4hashIeEclEe): New alias.
	* testsuite/util/testsuite_abi.cc (check_version): Support
	GLIBCXX_LDBL_3.4.10.

From-SVN: r132804