How to fix Fortran compilation warning?

[mrustl]

Warning: Found the following significant warnings:
  Warning: Named COMMON block 'par6' at (1) shall be of the same size as elsewhere (56 vs 24 bytes)

https://github.com/KWB-R/kwb.wtaq/runs/6848369238?check_suite_focus=true#step:9:48

Added compiler setting:

Warning: Non-portable flags in variable 'PKG_FFLAGS':
  -fno-range-check

https://github.com/KWB-R/kwb.wtaq/runs/6848369238?check_suite_focus=true#step:9:86

Already described here:
https://github.com/KWB-R/kwb.wtaq#3-known-issues