*/*: update for slotted Rust

guru version of this commit:
https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=01ba4dc61965ef7658a24728841c04c9a1ce4871

Closes: https://bugs.gentoo.org/943170
Closes: https://bugs.gentoo.org/943223
Closes: #260
Signed-off-by: Takuya Wakazono <pastalian46@gmail.com>

app-backup/pika-backup/pika-backup-0.7.2-r2.ebuild

@@ -323,6 +323,7 @@ CRATES="
 	zxcvbn@2.2.2
 "
 PYTHON_COMPAT=( python3_{9..13} )
+RUST_MIN_VER="1.75.0"
 inherit cargo gnome2-utils meson python-single-r1 xdg
 
 DESCRIPTION="Keep your data safe"
@@ -357,7 +358,6 @@ RDEPEND="
 	x11-libs/pango
 "
 BDEPEND="
-	>=virtual/rust-1.75.0
 	dev-util/itstool
 	sys-devel/gettext
 "
@@ -365,6 +365,11 @@ BDEPEND="
 # Rust
 QA_FLAGS_IGNORED="usr/bin/${PN} usr/bin/${PN}-monitor"
 
+pkg_setup() {
+	python-single-r1_pkg_setup
+	rust_pkg_setup
+}
+
 src_prepare() {
 	mv -T "${WORKDIR}/${PN}-v${PV}"* "${S}" || die
 	sed -i -e "/subdir('src')/d" "${S}/meson.build" || die