testsuite: Adjust gfortran.dg/pr95690.f90 line number.

gfortran produces associates a different line number for the same error
message depending on x86 versus other architectures.  This patch adjusts
the dg-error line number depending on the target.

gcc/testsuite/ChangeLog

2020-07-01  David Edelsohn  <dje.gcc@gmail.com>

	* gfortran.dg/pr95690.f90: Adjust dg-error line number.

Author: edelsohn

gcc/testsuite/gfortran.dg/pr95690.f90

@@ -2,8 +2,8 @@
 module m
 contains
    subroutine s
-      print *, (erfc) ! { dg-error "not a floating constant" }
-   end
+      print *, (erfc) ! { dg-error "not a floating constant" "" { target i?86-*-* x86_64-*-* } }
+   end ! { dg-error "not a floating constant" "" { target { ! "i?86-*-* x86_64-*-*" } } }
    function erfc()
    end
 end