Fixes for Intel 2024.2

[mathomp4]

GEOSgcm (and thus GEOSadas) will soon move to use Intel oneAPI 2024.2 which is Intel ifort 2021.13 and icx 2024.2.

Tests showed two issues. First there was a plain Fortran bug in GMAO_ods/ods_diagnc4.F90:

     ods%data%time(1:nobs) = int(rvals * 60,)

That trailing comma is just wrong. Per @gmao-msienkie below, this should be a "." and is such now.

icx also threw an error with some C code:

/discover/swdev/mathomp4/Models/GEOSadas-MAPLdevelop-Baselibs-7.25.0/src/Shared/@GMAO_Shared/GMAO_pyobs/VegType_io.c:17:5: error: call to undeclared library function 'exit' with type 'void (int) __attribute__((noreturn))'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   17 |     exit(1);
      |     ^
/discover/swdev/mathomp4/Models/GEOSadas-MAPLdevelop-Baselibs-7.25.0/src/Shared/@GMAO_Shared/GMAO_pyobs/VegType_io.c:17:5: note: include the header <stdlib.h> or explicitly provide a declaration for 'exit'

As the error states, we add #include <stdlib.h>

[gmao-msienkie]

Tests showed two issues. First there was a plain Fortran bug in GMAO_ods/ods_diagnc4.F90:

     ods%data%time(1:nobs) = int(rvals * 60,)

I think that the comma was supposed to be a period. Typing commas for periods is something that I frequently do but I almost always catch the mistake.
I started developing that code when we were supposed to be dropping the binary format diag files in favor of the nc4 output. As it turned out that didn't happen and so the code is not needed now.