*/*: change rust project's hardcoded target/release path [1/4]

Recently I had to fix bug 975031, which was the same issue. Hardcoded
target/release paths in the ebuilds for rust projects. And this will
fail if the debug use flag is enabled. Because then, instead of
target/release, rust compiles the binary to target/debug

using cargo_target_dir from the cargo.eclass fixes this problem

It does not touch some ebuilds tho because for some I wasn't fully sure
if I should change the paths, and for some I wanted to do it in a
separate commit

Signed-off-by: ingenarel (NeoJesus) <ingenarel_neojesus@disroot.org>
Part-of: https://codeberg.org/gentoo/guru/pulls/21
Signed-off-by: Michał Górny <mgorny@gentoo.org>

sys-apps/deepcool-digital-linux/deepcool-digital-linux-0.10.1.ebuild

@@ -72,7 +72,7 @@ src_compile() {
 src_install() {
 	cargo_src_install
 
-	dobin target/release/deepcool-digital-linux
+	dobin "$(cargo_target_dir)/deepcool-digital-linux"
 
 	newinitd "${FILESDIR}"/deepcool-digital-linux.initd deepcool-digital-linux
 	systemd_dounit "${FILESDIR}"/deepcool-digital-linux.service

sys-apps/deepcool-digital-linux/deepcool-digital-linux-0.10.2.ebuild

@@ -71,7 +71,7 @@ src_compile() {
 src_install() {
 	cargo_src_install
 
-	dobin target/release/deepcool-digital-linux
+	dobin "$(cargo_target_dir)/deepcool-digital-linux"
 
 	newinitd "${FILESDIR}"/deepcool-digital-linux.initd deepcool-digital-linux
 	systemd_dounit "${FILESDIR}"/deepcool-digital-linux.service

sys-apps/hexyl/hexyl-0.17.0.ebuild

@@ -107,10 +107,11 @@ src_install() {
 	einstalldocs
 	doman "doc/${PN}.1"
 
-	"target/release/${PN}" --completion bash > "${PN}"
+	local bin_path="$(cargo_target_dir)/${PN}"
+	"${bin_path}" --completion bash > "${PN}"
 	dobashcomp "${PN}"
-	"target/release/${PN}" --completion zsh  > "_${PN}"
+	"${bin_path}" --completion zsh  > "_${PN}"
 	dozshcomp "_${PN}"
-	"target/release/${PN}" --completion fish > "${PN}.fish"
+	"${bin_path}" --completion fish > "${PN}.fish"
 	dofishcomp "${PN}.fish"
 }