sys-cluster/er: Builds with mpi even if USE="-mpi"

got rid of src_configure and IUSE="mpi"
also made description a bit shorter to make
repoman happy

Package-Manager: Portage-2.3.89, Repoman-2.3.20
Signed-off-by: Andrew Ammerlaan <andrewammerlaan@riseup.net>

sys-cluster/er/er-0.0.3.ebuild

@@ -5,19 +5,17 @@ EAPI="7"
 
 inherit cmake-utils
 
-DESCRIPTION="High-level distributed erasure coding library combining functionality of shuffile and redset"
+DESCRIPTION="High-level distributed erasure coding lib combining shuffile  and redset"
 HOMEPAGE="https://github.com/ECP-VeloC/er"
 SRC_URI="https://github.com/ECP-VeloC/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
 
 LICENSE="MIT"
 SLOT="0"
 KEYWORDS="~amd64"
-IUSE="mpi test"
-RESTRICT="!test? ( test )"
 
 RDEPEND="
-	mpi? ( virtual/mpi )
-	sys-cluster/KVTree
+	virtual/mpi
+	sys-cluster/KVTree[mpi]
 	sys-cluster/redset
 	sys-cluster/shuffile
 	sys-libs/zlib
@@ -33,10 +31,3 @@ src_prepare() {
 	default
 	cmake-utils_src_prepare
 }
-
-src_configure() {
-	local mycmakeargs=(
-		-DMPI="$(usex mpi "" OFF)"
-	)
-	cmake-utils_src_configure
-}