Since C++17 the static members of the random number engines are
implicitly inline, so don't need definitions.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* include/bits/random.tcc [__cpp_inline_variables]: Remove
	redundant definitions of static constexpr member variables.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error
	line number.

Tested powerpc64le-linux. Committed to trunk.