feat(3p/nix): added meson support

(cherry picked from commit 086a81b7a5bbe1fc022efb5935ff68f6ad71ddaf)

third_party/nix/misc/upstart/meson.build

@@ -0,0 +1,26 @@
+# ifeq ($(OS), Linux)
+
+#   $(foreach n, nix-daemon.conf, $(eval $(call install-file-in, $(d)/$(n), $(sysconfdir)/init, 0644)))
+
+# endif
+
+
+# nix systemd build file
+#============================================================================
+
+if (sys_name.contains('linux'))
+
+    upstart_data = []
+
+    upstart_nix_daemon = configuration_data()
+    upstart_nix_daemon.set('bindir', bindir)
+
+    upstart_data += configure_file(
+        input : 'nix-daemon.conf.in',
+        output : 'nix-daemon.conf',
+        configuration : upstart_nix_daemon)
+
+    install_data(
+        upstart_data,
+        install_dir : join_paths(sysconfdir, 'init'))
+endif