configury: harden IGNORE_TKR check

NVIDIA HPC Compiler (e.g. nvfortran) incorrectly selected the GCC
style pragmas to support IGNORE_TKR. Harden the test by mimicking
exactly the mpi f08 bindings in order to fix that false positive.

Thanks Chris Parrot for the report.

Refs. open-mpi#11582

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>
bot:notacherrypick
(back-ported from commit 600df6a)

config/ompi_fortran_check_ignore_tkr.m4

@@ -189,8 +189,23 @@ AC_DEFUN([OMPI_FORTRAN_CHECK_IGNORE_TKR_SUB], [
     call foo(a, count)
   end subroutine force_assumed_shape
 
+  module check_ignore_tkr
+  interface foobar
+     subroutine foobar_x(buffer, count)
+       $1 buffer
+       $2, intent(in) :: buffer
+       integer, intent(in) :: count
+     end subroutine foobar_x
+  end interface
+  end module
+
+  subroutine bar(var)
+    use check_ignore_tkr
+    implicit none
+    real, intent(inout) :: var(:, :, :)
+
+    call foobar(var(1,1,1), 1)
 ! Autoconf puts "end" after the last line
-  subroutine bogus
 ]]),
                     [msg=yes
                      ompi_fortran_ignore_tkr_predecl="$1"