gnu: Add hdf-eos5.

* gnu/packages/maths.scm (hdf-eos5): New variable.
* gnu/packages/patches/hdf-eos5-build-shared.patch: New file.
* gnu/packages/patches/hdf-eos5-remove-gctp.patch: New file.
* gnu/packages/patches/hdf-eos5-fix-szip.patch: New file.
* gnu/packages/patches/hdf-eos5-fortrantests.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add patches.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>