libewf: fix build with gcc 5

Fixes #15289.

pkgs/development/libraries/libewf/04-fix-FTBFS-GCC5.patch

···
+Patch from Debian:
+https://sources.debian.net/data/main/libe/libewf/20140608-6/debian/patches/04-fix-FTBFS-GCC5.patch
+
+Description: fix a FTBFS with GCC-5. Thanks to Linn Crosetto <[e-mail]> for
+             the first fix (see #777938). This patch closes #777945.
+Author: Joao Eriberto Mota Filho <[e-mail]>
+Last-Update: 2015-07-02
+Index: libewf-20140608/libuna/Makefile.am
+===================================================================
+--- libewf-20140608.orig/libuna/Makefile.am
++++ libewf-20140608/libuna/Makefile.am
+@@ -3,7 +3,7 @@ AM_CPPFLAGS = \
+ 	-I$(top_srcdir)/include \
+ 	-I$(top_srcdir)/common \
+ 	@LIBCSTRING_CPPFLAGS@ \
+-	@LIBCERROR_CPPFLAGS@
++	@LIBCERROR_CPPFLAGS@ -std=gnu89
+ 
+ noinst_LTLIBRARIES = libuna.la
+ 

pkgs/development/libraries/libewf/default.nix

···
-{ fetchurl, stdenv, zlib, openssl, libuuid, file, fuse }:
+{ fetchurl, stdenv, zlib, openssl, libuuid, file, fuse, autoreconfHook, pkgconfig }:
 
 stdenv.mkDerivation rec {
   version = "20140608";
···
     sha256 = "0wfsffzxk934hl8cpwr14w8ixnh8d23x0xnnzcspjwi2c7730h6i";
   };
 
-  preConfigure = ''sed -e 's@/usr/bin/file@file@g' -i configure'';
-
+  nativeBuildInputs = [ autoreconfHook pkgconfig ];
   buildInputs = [ zlib openssl libuuid ];
+  patches = [ ./04-fix-FTBFS-GCC5.patch ];
 
   meta = {
     description = "Library for support of the Expert Witness Compression Format";
     homepage = http://sourceforge.net/projects/libewf/;
     license = stdenv.lib.licenses.lgpl3;
     maintainers = [ stdenv.lib.maintainers.raskin ] ;
+    platforms = stdenv.lib.platforms.unix;
     inherit version;
   };
 }