media-plugins/vdr-skinelchi: fixed c++-11 issues, removed imagemagick support

media-plugins/vdr-skinelchi: fixed c++-11 issues, removed imagemagick support

removed imagemagick support, as it is
broken on all imagemackig version in the tree
this needs to be fixed by upstream,
in this case we could readd the package again with imagemagick support
reduced to -std=gnu++11, as it fails on compile with newer gnu version
need also fixing by upstream

Bug: https://bugs.gentoo.org/599148
Bug: https://bugs.gentoo.org/314313
Closes: https://bugs.gentoo.org/599148
Closes: https://bugs.gentoo.org/314313
Package-Manager: Portage-2.3.82, Repoman-2.3.18
Signed-off-by: Joerg Bornkessel <hd_brummy@gentoo.org>