David Guglielmi authored Mar 28, 2017 and Cédric Bellegarde committed Mar 28, 2017

The "install-data-hook" provoke a sandbox access violation when we try to
install Lollypop on Gentoo.

Using the libexec_SCRIPTS macro make the searchprovider executable and
move lollypop-sp to libexec directory that is a better place for this script.
(see gnome-calculator searchprovier)