warnings for degrib2

[edwardhartnett]

[ 21%] Building Fortran object utils/CMakeFiles/degrib2.dir/degrib2.F90.o
/home/ed/NCEPLIBS-g2/utils/degrib2.F90:62:13:

   62 |      lgrib = lgrib8
      |             1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]
/home/ed/NCEPLIBS-g2/utils/degrib2.F90:69:18:

   69 |         currlen = lgrib8
      |                  1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]
/home/ed/NCEPLIBS-g2/utils/degrib2.F90:72:15:

   72 |      lengrib = lengrib8
      |               1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]
[ 21%] Linking Fortran executable degrib2