[v3] Enable dg-reqire-sharedlib on Solaris

[Rainer Orth]

I happened to notice that dg-require-sharedlib hardcodes the targets
that shared library, and Solaris is missing.  Fixed with the following
patch.

Bootstrapped on i386-pc-solaris2.12, the affected testcases now PASS.
Ok for mainline?

	Rainer


2016-05-04  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* testsuite/lib/libstdc++.exp (libstdc++_init): Enable on
	*-*-solaris*.

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Rainer Orth, Center for Biotechnology, Bielefeld University