use cabal-tweak-drop-dep for bytestring-builder

ghc-io-streams.spec

@@ -12,7 +12,6 @@ Summary:        Simple, composable, easy-to-use stream I/O
 License:        BSD
 Url:            https://hackage.haskell.org/package/%{pkg_name}
 Source0:        https://hackage.haskell.org/package/%{pkg_name}-%{version}/%{pkg_name}-%{version}.tar.gz
-Patch1:         io-streams-bytestring-builder.patch
 
 BuildRequires:  ghc-Cabal-devel
 BuildRequires:  ghc-rpm-macros
@@ -74,7 +73,7 @@ This package provides the Haskell %{pkg_name} library development files.
 
 %prep
 %setup -q -n %{pkg_name}-%{version}
-%patch1 -p1 -b .orig
+cabal-tweak-drop-dep bytestring-builder
 
 
 %build

io-streams-bytestring-builder.patch

@@ -1,18 +0,0 @@
---- io-streams-1.3.2.0/io-streams.cabal~	2015-08-05 06:25:51.000000000 +0900
-+++ io-streams-1.3.2.0/io-streams.cabal	2015-09-29 17:45:42.208861421 +0900
-@@ -120,7 +120,6 @@
-   Build-depends:     base               >= 4     && <5,
-                      attoparsec         >= 0.10  && <0.14,
-                      bytestring         >= 0.9   && <0.11,
--                     bytestring-builder >= 0.10  && <0.11,
-                      network            >= 2.3   && <2.7,
-                      primitive          >= 0.2   && <0.7,
-                      process            >= 1.1   && <1.3,
-@@ -201,7 +200,6 @@
-   Build-depends:     base               >= 4     && <5,
-                      attoparsec         >= 0.10  && <0.14,
-                      bytestring         >= 0.9   && <0.11,
--                     bytestring-builder >= 0.10  && <0.11,
-                      deepseq            >= 1.2   && <1.5,
-                      directory          >= 1.1   && <2,
-                      filepath           >= 1.2   && <2,