* gnu/packages/bittorrent.scm (transmission): Update to 4.0.6.
[source]: Use the new patch.
[arguments]: Adjust the custom build phase 'remove-kernel-version' for 4.0.6.
* gnu/packages/patches/transmission-4.0.5-fix-build.patch: Delete file.
* gnu/packages/patches/transmission-4.0.6-fix-build.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
Change-Id: Id546b8537f48afd50bb00183abf7821ad7601fe9