dev-haskell/alut: fix USE=example for modern GHC

Reported-by: Toralf Förster
Closes: https://bugs.gentoo.org/773379
Package-Manager: Portage-3.0.16, Repoman-3.0.2
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

dev-haskell/alut/alut-2.4.0.3.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2019 Gentoo Authors
+# Copyright 1999-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -32,6 +32,8 @@ DEPEND="${RDEPEND}
 
 S="${WORKDIR}/${MY_P}"
 
+PATCHES=("${FILESDIR}"/${PN}-2.4.0.3-ghc-8.patch)
+
 src_configure() {
 	haskell-cabal_src_configure \
 		$(cabal_flag examples buildexamples) \

dev-haskell/alut/files/alut-2.4.0.3-ghc-8.patch

@@ -0,0 +1,10 @@
+--- a/examples/Basic/OpenALInfo.hs
++++ b/examples/Basic/OpenALInfo.hs
+@@ -7,6 +7,7 @@
+ 
+ import Text.PrettyPrint
+ import Sound.ALUT
++import Prelude hiding ((<>))
+ 
+ -- This program prints some basic information about ALC and AL.
+