*/*: 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>

dev-libs/dmd_core/dmd_core-0.7.2-r1.ebuild

@@ -55,16 +55,8 @@ KEYWORDS="~amd64"
 
 RESTRICT="test"
 
-# There are inconsistencies in the minimum required version between
-# the homepage of the package and the README of its primary consumer,
-# developed by the same person. Since the primary consumer directly
-# pulls up the library as a Git submodule (patched out to use a
-# standalone library in Gentoo) and does not require Rust by itself,
-# we presume that that is more accurate.
-BDEPEND=">=virtual/rust-1.50.0"
-
 src_install() {
-	dolib.a target/$(usex debug debug release)/lib${PN}.a
+	dolib.a "$(cargo_target_dir)"/lib${PN}.a
 	insinto /usr/$(get_libdir)/pkgconfig
 	doins "${FILESDIR}"/dmd_core.pc
 	sed -e "s/%VERSION%/${PV}/g" \