[flang] Disable blockdata_4.f90

The error caught by gfortran in Fortran/gfortran/regression/blockdata_4.f90
is intentionally no longer an error in f18 but instead a supported
extension after https://reviews.llvm.org/D155496.

Differential Revision: https://reviews.llvm.org/D155613

Author: klausler

Fortran/gfortran/regression/DisabledFiles.cmake

@@ -2317,6 +2317,7 @@ file(GLOB FAILING_FILES CONFIGURE_DEPENDS
   binding_label_tests_29.f90
   binding_label_tests_34.f90
   block_3.f90
+  blockdata_4.f90
   blockdata_5.f90
   blockdata_6.f90
   bounds_check_18.f90