gpgme: convert macos sed patch scripts to patch files

This is less brittle and breaks loud if the code changes.
Also remove the /usr/bin/file patch. It is not really required
for the build to work, the generated warning is harmless.

pkgs/development/libraries/gpgme/default.nix

@@ -1,4 +1,5 @@
-{ stdenv, fetchurl, fetchpatch, libgpgerror, gnupg, pkgconfig, glib, pth, libassuan
+{ stdenv, fetchurl, fetchpatch
+, autoreconfHook, libgpgerror, gnupg, pkgconfig, glib, pth, libassuan
 , file, which, ncurses
 , texinfo
 , buildPackages
@@ -33,7 +34,14 @@ stdenv.mkDerivation rec {
       url = "http://git.gnupg.org/cgi-bin/gitweb.cgi?p=gpgme.git;a=patch;h=c4cf527ea227edb468a84bf9b8ce996807bd6992";
       sha256 = "pKL1tvUw7PB2w4FHSt2up4SvpFiprBH6TLdgKxYFC3g=";
     })
-  ];
+    # https://lists.gnupg.org/pipermail/gnupg-devel/2020-April/034591.html
+    (fetchpatch {
+      name = "0001-Fix-python-tests-on-non-Linux.patch";
+      url = "https://lists.gnupg.org/pipermail/gnupg-devel/attachments/20200415/f7be62d1/attachment.obj";
+      sha256 = "00d4sxq63601lzdp2ha1i8fvybh7dzih4531jh8bx07fab3sw65g";
+    })
+    # Disable python tests on Darwin as they use gpg (see configureFlags below)
+  ] ++ lib.optional stdenv.isDarwin ./disable-python-tests.patch;
 
   outputs = [ "out" "dev" "info" ];
   outputBin = "dev"; # gpgme-config; not so sure about gpgme-tool
@@ -42,24 +50,11 @@ stdenv.mkDerivation rec {
     [ libgpgerror glib libassuan pth ]
     ++ lib.optional (qtbase != null) qtbase;
 
-  nativeBuildInputs = [ file pkgconfig gnupg texinfo ]
+  nativeBuildInputs = [ pkgconfig gnupg texinfo autoreconfHook ]
   ++ lib.optionals pythonSupport [ python swig2 which ncurses ];
 
   depsBuildBuild = [ buildPackages.stdenv.cc ];
 
-  postPatch =''
-    substituteInPlace ./configure --replace /usr/bin/file ${file}/bin/file
-  ''
-  # Apply only on Darwin to save rebuilds on Linux
-     + lib.optionalString stdenv.isDarwin ''
-    sed -i "s/LD_LIBRARY_PATH/@shlibpath_var@/" lang/python/tests/Makefile.in
-    sed -i "s/ac_subst_vars='/ac_subst_vars='shlibpath_var\n/" configure
-  ''
-  # Disable python tests on Darwin as they use gpg (see configureFlags below)
-     + lib.optionalString stdenv.isDarwin ''
-    sed -i "s/SUBDIRS = \. tests/SUBDIRS = ./" lang/python/Makefile.in
-  '';
-
   configureFlags = [
     "--enable-fixed-path=${gnupg}/bin"
     "--with-libgpg-error-prefix=${libgpgerror.dev}"

pkgs/development/libraries/gpgme/disable-python-tests.patch

@@ -0,0 +1,12 @@
+diff -Naur --strip-trailing-cr gpgme-1.13.1.org/lang/python/Makefile.am gpgme-1.13.1/lang/python/Makefile.am
+--- gpgme-1.13.1.org/lang/python/Makefile.am	2019-06-04 07:27:49.000000000 +0100
++++ gpgme-1.13.1/lang/python/Makefile.am	2020-04-15 14:27:34.810172944 +0100
+@@ -23,7 +23,7 @@
+ 	gpgme.i \
+ 	helpers.c helpers.h private.h
+ 
+-SUBDIRS = . tests examples doc src
++SUBDIRS = . examples doc src
+ 
+ .PHONY: prepare
+ prepare: copystamp