dev-lang/ruby: support Prefix for 2.3.6.

  Minor ED update without revision bump. The similar fixes are already
  in 2.4 and 2.5.

Reported-By: Martin Mokrejš
Closes: https://bugs.gentoo.org/633358

Package-Manager: Portage-2.3.24, Repoman-2.3.6

dev-lang/ruby/ruby-2.3.6.ebuild

@@ -202,10 +202,10 @@ src_install() {
 	emake V=1 DESTDIR="${D}" install || die "make install failed"
 
 	# Remove installed rubygems and rdoc copy
-	rm -rf "${D}/usr/$(get_libdir)/ruby/${RUBYVERSION}/rubygems" || die "rm rubygems failed"
-	rm -rf "${D}/usr/bin/"gem"${MY_SUFFIX}" || die "rm rdoc bins failed"
-	rm -rf "${D}/usr/$(get_libdir)/ruby/${RUBYVERSION}"/rdoc* || die "rm rdoc failed"
-	rm -rf "${D}/usr/bin/"{ri,rdoc}"${MY_SUFFIX}" || die "rm rdoc bins failed"
+	rm -rf "${ED}/usr/$(get_libdir)/ruby/${RUBYVERSION}/rubygems" || die "rm rubygems failed"
+	rm -rf "${ED}/usr/bin/"gem"${MY_SUFFIX}" || die "rm rdoc bins failed"
+	rm -rf "${ED}/usr/$(get_libdir)/ruby/${RUBYVERSION}"/rdoc* || die "rm rdoc failed"
+	rm -rf "${ED}/usr/bin/"{ri,rdoc}"${MY_SUFFIX}" || die "rm rdoc bins failed"
 
 	if use doc; then
 		make DESTDIR="${D}" install-doc || die "make install-doc failed"