meson: install libexec binaries

Change-Id: I149892bf081e1569d7786f085e890bc3d2eb50e5

meson.build

@@ -50,6 +50,7 @@ path_opts = [
   'mandir',
   'libdir',
   'includedir',
+  'libexecdir',
   # Homecooked Lix directories.
   'store-dir',
   'state-dir',

src/nix/meson.build

@@ -118,3 +118,11 @@ foreach linkname : nix_symlinks
     install_tag : 'runtime'
   )
 endforeach
+
+install_symlink(
+  'build-remote',
+  pointing_to : bindir / 'nix',
+  install_dir : libexecdir / 'nix',
+  # The 'runtime' tag is what executables default to, which we want to emulate here.
+  install_tag : 'runtime'
+)