GTiff: fix error message when requesting a non existing directory

git-svn-id: https://svn.osgeo.org/gdal/trunk@27224 f0d54148-0727-0410-94bb-9a71ac55c965
Alternative method to fix Python bindings build on MacOsX 10.9, trough ARCHFLAGS

git-svn-id: https://svn.osgeo.org/gdal/trunk@27225 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx