app-shells/fzf: Adding ebuild for fzf

app-shells/fzf: Adding ebuild for fzf

fzf is a tool to provide Addressing the comments in the PR. It
integrates with vim and several shell-completion tools. Bash, fish and
zsh.
Plus, a patch has been added to fix a building issue preventing
the package from being built when LDFLAGS contains space(s).
More infor here: https://github.com/junegunn/fzf/issues/1994

Closes: https://bugs.gentoo.org/703082
Signed-off-by: Raffaele Spinelli <rafspiny@gmail.com>
Closes: https://github.com/gentoo/gentoo/pull/15377
Signed-off-by: Joonas Niilola <juippis@gentoo.org>