nix: Update patches for 2.0

* Drop stat patch as was accepted upstream.
* NIX_REMOTE scheme is now URI based tcp://host:port

temporary/all-temporary.nix

@@ -7,9 +7,4 @@
 
 self: super: pkgs: with pkgs; {
 
-  # https://github.com/NixOS/nix/pull/1645
-  nixStable = super.nixStable.overrideAttrs
-    ( attrs: { patches = attrs.patches or [] ++ [ ./nix/stat.patch ]; } );
-  nix = super.nix.overrideAttrs
-    ( attrs: { patches = attrs.patches or [] ++ [ ./nix/stat.patch ]; } );
 }

temporary/nix/stat.patch

@@ -1,33 +0,0 @@
-diff --git a/src/libutil/util.cc b/src/libutil/util.cc
-index 0b11330..4c1dff2 100644
---- a/src/libutil/util.cc
-+++ b/src/libutil/util.cc
-@@ -198,17 +198,17 @@ bool pathExists(const Path & path)
- Path readLink(const Path & path)
- {
-     checkInterrupt();
--    struct stat st = lstat(path);
--    if (!S_ISLNK(st.st_mode))
--        throw Error(format("‘%1%’ is not a symlink") % path);
--    char buf[st.st_size];
--    ssize_t rlsize = readlink(path.c_str(), buf, st.st_size);
--    if (rlsize == -1)
--        throw SysError(format("reading symbolic link ‘%1%’") % path);
--    else if (rlsize > st.st_size)
--        throw Error(format("symbolic link ‘%1%’ size overflow %2% > %3%")
--            % path % rlsize % st.st_size);
--    return string(buf, st.st_size);
-+    for (ssize_t bufSize = PATH_MAX/4; true; bufSize += bufSize/2) {
-+        char buf[bufSize];
-+        ssize_t rlSize = readlink(path.c_str(), buf, bufSize);
-+        if (rlSize == -1)
-+            if (errno == EINVAL)
-+                throw Error(format("'%1%' is not a symlink") % path);
-+            else
-+                throw SysError(format("reading symbolic link '%1%'") % path);
-+        else if (rlSize < bufSize)
-+            return string(buf, rlSize);
-+    }
- }
- 
-