[gentoo-dev] Changes to netsurf.eclass - please review the attached patch

[Lukas Vacek]

Hello,

When trying to emerge media-libs/libnsgif (or other netsurf build system
using packages) in prefix the compilation fails because the ebuilds are
sourcing a bash script directly from
/usr/share/netsurf-buildsystem/gentoo-helpers.sh

This patch is replacing gentoo-helpers.sh with an eclass which is then used
in all ebuilds which are now sourcing gentoo-helpers.sh for more details
please see PR 16702 on github https://github.com/gentoo/gentoo/pull/16702

Thanks
Lucas