dev-haskell/uuagc: drop broken IUSE, bug #651280

USE=bootstrap_external requires a missing file in tarball.

Reported-by: Toralf Förster
Closes: https://bugs.gentoo.org/651280
Package-Manager: Portage-2.3.36, Repoman-2.3.9

dev-haskell/uuagc/metadata.xml

@@ -6,7 +6,6 @@
 		<name>Gentoo Haskell</name>
 	</maintainer>
 	<use>
-		<flag name="bootstrap_external">Use an external uuagc executable for bootstrapping.</flag>
 		<flag name="with-loag">Use <pkg>dev-haskell/minisat</pkg> external SAT-solver to schedule all Linear Ordered AGs.</flag>
 	</use>
 	<longdescription>

dev-haskell/uuagc/uuagc-0.9.52.1.ebuild

@@ -1,11 +1,12 @@
-# Copyright 1999-2015 Gentoo Foundation
+# Copyright 1999-2018 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=5
 
-# ebuild generated by hackport 0.4.4.9999
+# ebuild generated by hackport 0.5.5.9999
+#hackport: flags: -bootstrap_external
 
-CABAL_FEATURES="bin lib profile haddock hoogle hscolour"
+CABAL_FEATURES="lib profile haddock hoogle hscolour"
 inherit haskell-cabal
 
 DESCRIPTION="Attribute Grammar System of Universiteit Utrecht"
@@ -15,7 +16,7 @@ SRC_URI="mirror://hackage/packages/archive/${PN}/${PV}/${P}.tar.gz"
 LICENSE="BSD"
 SLOT="0/${PV}"
 KEYWORDS="~amd64 ~x86"
-IUSE="bootstrap_external with-loag"
+IUSE="with-loag"
 
 RDEPEND=">=dev-haskell/haskell-src-exts-1.11.1:=[profile?]
 	>=dev-haskell/mtl-1.1.1.1:=[profile?]
@@ -30,6 +31,6 @@ DEPEND="${RDEPEND}
 
 src_configure() {
 	haskell-cabal_src_configure \
-		$(cabal_flag bootstrap_external bootstrap_external) \
+		--flag=-bootstrap_external \
 		$(cabal_flag with-loag with-loag)
 }