build issues on centos 7

[Daniele Branchini]

proj.F90:288.66:

   INT(MIN(SIZE(x),SIZE(y),SIZE(z)), kind=c_long), 1_c_int, C_LOC(x), C_LOC(y),
                                                                  1
Error: Assumed-shape array 'x' at (1) cannot be an argument to the procedure 'c_loc' because it is not C interoperable
proj.F90:291.58:

   INT(MIN(SIZE(x),SIZE(y)), kind=c_long), 1_c_int, C_LOC(x), C_LOC(y), C_NULL_
                                                          1
Error: Assumed-shape array 'x' at (1) cannot be an argument to the procedure 'c_loc' because it is not C interoperable
make[2]: *** [proj.lo] Error 1

full log:
https://simc.arpae.it/moncic-ci/fortrangis/last/master/centos7/build.log
or:
https://travis-ci.org/github/ARPA-SIMC/fortrangis/jobs/771558906#L1543