Fix to FortranWrapper.h that enables SerialBox to compile with Fortran features on MacOS

[gmao-ckung]

Compiling the current master branch on MacOS Catalina results in the following undefined symbol errors

Undefined symbols for architecture x86_64: 
  "_serialboxFortranSavepointAddMetainfoInt64", referenced from: 
      ___m_serialize_MOD_fs_add_savepoint_metainfo_l in m_serialize.f90.o 
  "_serialboxFortranSavepointGetMetainfoInt64", referenced from: 
      ___m_serialize_MOD_fs_get_savepoint_metainfo_l in m_serialize.f90.o 
  "_serialboxFortranSerializerAddFieldMetainfoInt64", referenced from: 
      ___m_serialize_MOD_fs_add_field_metainfo_l in m_serialize.f90.o 
  "_serialboxFortranSerializerAddMetainfoInt64", referenced from: 
      ___m_serialize_MOD_fs_add_serializer_metainfo_l in m_serialize.f90.o 
  "_serialboxFortranSerializerGetFieldMetainfoInt64", referenced from: 
      ___m_serialize_MOD_fs_get_field_metainfo_l in m_serialize.f90.o 
  "_serialboxFortranSerializerGetMetainfoInt64", referenced from: 
      ___m_serialize_MOD_fs_get_serializer_metainfo_l in m_serialize.f90.o 

The fix is to change the long and long* parameter types for the Int64 routines in FortranWrapper.h to int64_t and int64_t* respectively.

This was tested using MacOS Catalina v 10.15.7 and built using MacOS clang-based C and C++ compilers and gfortran v 11.1.0 installed via Homebrew.

[jenkins-apn]

Hi there, this is jenkins continuous integration...
Do you want me to verify this patch?

[gmao-ckung]

Yes verify the patch

[havogt]

launch jenkins

[havogt]

Thanks, for the contribution. Please merge with the updated master to reflect the fixes in CI.

[havogt]

Additionally, please add yourself at the bottom of the AUTHORS file with name and affiliation.

[havogt]

And in case your are motivated, a PR to extending the GitHub action tests to MacOS is very welcome, see #246.

[havogt]

Hi @gmao-ckung,
for contributions to the GridTools framework, which contains Serialbox, I need to ask you to sign the contributor assignment agreement. (I thought you are employed at Vulcan, which would have been covered already.) Please send the signed document to vogt@cscs.ch. Alternatively, for this particular, obvious contribution, I can merge directly, if you confirm that such a contribution is not copyrightable and you remove yourself again from the AUTHORS list. Sorry, for the confusion.

[gmao-ckung]

Hi @havogt,

I apologize for the confusion about my affiliation. Given that this fix is relatively small, I think it’ll be easiest if I take my name off the “AUTHORS” list. I’ll resubmit a version with my name off the list. You can merge the changes once I make the edit.

[havogt]

Please give Andrea his n back. ;)

[gmao-ckung]

Good catch!

[havogt]

Thanks again for the fix!