dev-python/pyeclib: add additional test deps/optfeatures

Some tests are skipped (though non-obviously, it's not just the availability
test, but some extra ones later on at the end), without these.

See 614f0167e7 too.

Signed-off-by: Sam James <sam@gentoo.org>

dev-python/pyeclib/pyeclib-1.6.4.ebuild

@@ -27,6 +27,8 @@ RDEPEND="
 "
 BDEPEND="
 	test? (
+		dev-libs/isa-l
+		dev-libs/jerasure
 		dev-python/six[${PYTHON_USEDEP}]
 	)
 "
@@ -40,5 +42,6 @@ src_prepare() {
 }
 
 pkg_postinst() {
+	optfeature "isa-l backend" dev-libs/isa-l
 	optfeature "jerasure backend" dev-libs/jerasure
 }