* acinclude.m4 ([GLIBCXX_CHECK_RANDOM_TR1]): New, check for
	the availability of "/dev/random" and "/dev/urandom".
	* configure.ac: Use it.
	* include/tr1/random (random_device): Implement, a fall-back for
	systems not providing "/dev/random" and "/dev/urandom" included.
	* testsuite/tr1/5_numerical_facilities/random/random_device/
	cons/default.cc: New.
	* testsuite/tr1/5_numerical_facilities/random/random_device/
	cons/token.cc: Likewise.
	* testsuite/tr1/5_numerical_facilities/random/random_device/
	requirements/typedefs.cc: Likewise.
	* config.h.in: Regenerate.
	* configure: Likewise.

	* testsuite/tr1/5_numerical_facilities/random/mersenne_twister/
	cons/gen1.cc: Minor tweak, add bool test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@114529 138bc75d-0d04-0410-961f-82ee72b054a4