Remove backup file.

From-SVN: r84716

gcc/testsuite/gfortran.dg/g77/19990905-1.f~

-c { dg-do compile }
-c
-c  g77 gave error
-c  19990905-1.f: In subroutine `x':
-c  19990905-1.f:15: 
-c           common /foo/n
-c                   1
-c  19990905-1.f:18: (continued):
-c           call foo(a(1))
-c                2
-c  Invalid declaration of or reference to symbol `foo' at (2) [initially seen at (1)]
-* =foo7.f in Burley's g77 test suite.
-      subroutine x
-      real a(n)
-      common /foo/n
-      continue
-      entry y(a)
-      call foo(a(1))
-      end
-c { dg-excess-errors "" }