Add byteswapio to LDFLAGS for CCE

[mattdturner]

Add the -h byteswapio flag to LDFLAGS for all Macros.*_cray files.

• Developer(s): Matt Turner

• Please suggest code Pull Request reviewers in the column at right.

• Are the code changes bit for bit, different at roundoff level, or more substantial? More substantial, but this fixes a bug that caused runs with CCE to not complete

• Is the documentation being updated with this PR? (Y/N) N
  If not, does the documentation need to be updated separately at a later time? (Y/N) N
  Note: "Documentation" includes information on the wiki and .rst files in doc/source/,
  which are used to create the online technical docs at https://readthedocs.org/projects/cice-consortium-cice/.

• Other Relevant Details:
  This addresses Crashes when using CCE #119
  The Macros.*_cray files had -h byteswapio in FFLAGS, but not in LDFLAGS. However, according to the Cray documentation "[b]yteswapio is implemented during the linker phase so that it can be uniformly applied across the entire executable", so -h byteswapio has to be included in LDFLAGS.

[apcraig]

Thanks Matt! Will merge once the travis tests are complete.