Improper use of equivalence statement in endf.f90

In the file `endf.f90` the following lines appear (around line 29):
```fortran
   character(4)::hol(17)
   real(kr)::rhol(17)
   equivalence(hol(1),rhol(1))
```
This produces an error when compiling
```
F90-S-0310-Cannot EQUIVALENCE non-character and character in the specification part of a MODULE (/app/NJOY2016/src/endf.f90)
```
This issue seems to only affect the flang compiler.
