dev-haskell/transformers-compat: revert "drop old"

This reverts commit 1185cd5eaf.

adga uses older transfomers-compat.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

dev-haskell/transformers-compat/Manifest

@@ -1 +1,2 @@
+DIST transformers-compat-0.5.1.4.tar.gz 18574 BLAKE2B e08bbb9b6104a9e46b17478b156d4e5b9198ab9e93ecc1e0faec4402a8b403b19ee517bb81a1f4c0d8633ff6a74ec59470d6a27a3c3df947ee25ce11312a84a0 SHA512 7e4ff75cdae7afbf640b3ddbfc0a260be8bb3b06cdb1be803bfd7cdb333d289919164923ab4fcde4b270883548cce115643f908410ed394aec67efa389d5aeb2
 DIST transformers-compat-0.6.5.tar.gz 40421 BLAKE2B c3d4b55bef310f717cdf2069a4d8b58cc38ea037bbd982f21c11ddbfd3175689f681fed615f30f7026e826e90a0ee6bee51e7448ad2468a084ed00ad6311a643 SHA512 86ce6e81baf4e71cc4ac854066543a8777628ae67182e8059e582754608b279a053f7f98a539ec5cc07e1771d8173a6de6ebe5df4eee2b4c41278734774c3958

dev-haskell/transformers-compat/transformers-compat-0.5.1.4.ebuild

@@ -0,0 +1,42 @@
+# Copyright 1999-2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=5
+
+# ebuild generated by hackport 0.4.7.9999
+#hackport: flags: -two,+mtl
+
+CABAL_FEATURES="lib profile haddock hoogle hscolour"
+inherit haskell-cabal
+
+DESCRIPTION="A small compatibility shim for dev-haskell/transformers"
+HOMEPAGE="https://github.com/ekmett/transformers-compat/"
+SRC_URI="https://hackage.haskell.org/package/${P}/${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0/${PV}"
+KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
+IUSE=""
+
+RDEPEND=">=dev-lang/ghc-7.4.1:=
+	>=dev-haskell/mtl-2.1:=[profile?]
+	>=dev-haskell/transformers-0.3:=[profile?]
+"
+DEPEND="${RDEPEND}
+	>=dev-haskell/cabal-1.8
+"
+
+src_configure() {
+	local tf_arg=()
+
+	if has_version '=dev-haskell/transformers-0.3*'; then
+		tf_arg+=(--flag=three)
+	else
+		tf_arg+=(--flag=-three)
+	fi
+
+	haskell-cabal_src_configure \
+		--flag=mtl \
+		--flag=-two \
+		${tf_arg[@]}
+}