releases: handle sys-devel/libtool -> dev-build/libtool pkgmove

Signed-off-by: Sam James <sam@gentoo.org>

releases/specs-qemu/alpha/installcd-stage2-minimal.spec

@@ -54,6 +54,7 @@ livecd/unmerge:
 	app-admin/perl-cleaner
 	app-admin/python-updater
 	app-arch/cpio
+	dev-build/libtool
 	dev-libs/gmp
 	dev-libs/libxml2
 	dev-libs/mpfr
@@ -85,7 +86,6 @@ livecd/unmerge:
 	sys-devel/gcc-config
 	sys-devel/gettext
 	sys-devel/gnuconfig
-	sys-devel/libtool
 	sys-devel/m4
 	sys-devel/make
 	sys-devel/patch