gnutls: fixup various problems

- disable a test that started failing due to date expiration, see #16610
- bash doesn't need adding
- defining patchPhase was overriding passed postPatch and patches

pkgs/development/libraries/gnutls/generic.nix

@@ -11,11 +11,17 @@ assert guileBindings -> guile != null;
 stdenv.mkDerivation {
   name = "gnutls-${version}";
 
-  inherit src patches postPatch;
+  inherit src patches;
 
   outputs = [ "dev" "out" "bin" "man" "docdev" ];
   outputInfo = "docdev";
 
+  postPatch = ''
+    sed '2iecho "name constraints tests skipped due to datefudge problems"\nexit 0' \
+      -i tests/cert-tests/name-constraints
+  '' + postPatch;
+
+  preConfigure = "patchShebangs .";
   configureFlags =
     lib.optional stdenv.isLinux "--with-default-trust-store-file=/etc/ssl/certs/ca-certificates.crt"
   ++ [
@@ -29,7 +35,7 @@ stdenv.mkDerivation {
   # for the actual fix.
   enableParallelBuilding = !guileBindings;
 
-  buildInputs = [ lzo lzip nettle libtasn1 libidn p11_kit zlib gmp autogen nettools bash ]
+  buildInputs = [ lzo lzip nettle libtasn1 libidn p11_kit zlib gmp autogen nettools ]
     ++ lib.optional (stdenv.isFreeBSD || stdenv.isDarwin) libiconv
     ++ lib.optional (tpmSupport && stdenv.isLinux) trousers
     ++ [ unbound ]
@@ -37,10 +43,6 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = [ perl pkgconfig ] ++ nativeBuildInputs;
 
-  patchPhase = ''
-    patchShebangs .
-    '';
-
   # XXX: Gnulib's `test-select' fails on FreeBSD:
   # http://hydra.nixos.org/build/2962084/nixlog/1/raw .
   doCheck = (!stdenv.isFreeBSD && !stdenv.isDarwin);