Ecat patch for LLN support for STIR

This is a patch to apply in the ecat library, usually downloaded from OpenGateCollboration, in order to be able to complile STIR with LLN support.

For information and reasoning on the nessesity of this patch please refer to this discussion on github, issue #207.

This wiki page provides instruction on how to install the patch. Briefly,

1. Go to the local ecat directory (before compilation)
2. Move the patch file to the directory of the original folder
3. This folder will get modified, so make a backup of it somewhere
4. Run:

patch -s -p0 < stir_ecat_no_rts_no_xdr.patch

5. At this point, the original folder contains the modified content.

Good luck with your reconstructions!