dev-java/oracle-jdk-bin: Add elfutils as Linux-only dep to 9

No point using virtual/libelf as we only need to cater for Linux and
not FreeBSD, which Oracle do not support.

Closes: https://bugs.gentoo.org/646750
Package-Manager: Portage-2.3.21, Repoman-2.3.6

dev-java/oracle-jdk-bin/oracle-jdk-bin-9.0.4-r1.ebuild

@@ -67,11 +67,14 @@ RDEPEND="!x64-macos? (
 			)
 		)
 	)
+	!prefix? (
+		dev-libs/elfutils
+		sys-libs/glibc:*
+	)
 	alsa? ( media-libs/alsa-lib )
 	cups? ( net-print/cups )
 	doc? ( dev-java/java-sdk-docs:${SLOT} )
 	fontconfig? ( media-libs/fontconfig:1.0 )
-	!prefix? ( sys-libs/glibc:* )
 	selinux? ( sec-policy/selinux-java )"
 
 pkg_nofetch() {