dev-db/turso: Optimized myfeatures

* Using "usev" instead of the complex "usex".
* Added "mimalloc" as unconditional feature which is the upstream default
  but was removed by --no-default-features so far by our ebuild.

Signed-off-by: Jonas Frei <freijon@pm.me>

dev-db/turso/turso-0.4.3-r1.ebuild

@@ -52,7 +52,8 @@ src_configure() {
 	export LIBGIT2_NO_VENDOR=1
 
 	local myfeatures=(
-		$(use uring && usex "uring" "io_uring")
+		"mimalloc"
+		$(usev uring io_uring)
 	)
 	cargo_src_configure --no-default-features
 }