Jonathan Wakely e339291fc1 Fix new testcase to not require std::copysign
Use __builtin_copysign{,f,l} when std::copysign isn't available.

	PR libstdc++/61761
	* testsuite/26_numerics/complex/proj.cc: Don't assume <cmath> defines
	std::copysign.

From-SVN: r270859
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