x11-plugins/gkwebmon: new EAPI=6 revision that respects LDFLAGS.

x11-plugins/gkwebmon: new EAPI=6 revision that respects LDFLAGS.

This new revision is based on the ebuild submitted by Michael
Mair-Keimberger, updated for EAPI=6. The Makefile patch was rewritten;
a lot was simplified by simply appending to the implicit variables
CFLAGS, CPPFLAGS, LDFLAGS, and LDLIBS. The build system should now
respect all of those.

A missing dependency on dev-libs/openssl was added based on -lssl
being present in LDLIBS. The ebuild was also keyworded ~amd64, since
that's what I tested on.

Gentoo-Bug: 334761

Package-Manager: portage-2.2.28