coarray_data_1.f90: Link against libatomic if target libatomic_available.

	* gfortran.dg/coarray_data_1.f90: Link against libatomic if target
	libatomic_available.

From-SVN: r269534

gcc/testsuite/ChangeLog

+2019-03-09  John David Anglin  <dave.anglin@bell.net>
+
+	* gfortran.dg/coarray_data_1.f90: Link against libatomic if target
+	libatomic_available.
+
 2019-03-09  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	PR d/89041

gcc/testsuite/gfortran.dg/coarray_data_1.f90

 ! { dg-do  run }
 ! { dg-options "-fcoarray=lib -lcaf_single " }
+! { dg-additional-options "-latomic" { target libatomic_available } }
 ! PR 71066 - this used to ICE
 program p
    real :: a(2,2)[*]