bindata: Add infrastructure for building core mcl files

This should prepare us so that we can build native mcl code alongside
the core *.go files which we already have. This includes a single mcl
file that is used as a placeholder so that the build doesn't fail if we
don't have any mcl files in the core/ directory. It will get ignored
automatically.

lang/funcs/bindata/doc.go

@@ -0,0 +1,19 @@
+// Mgmt
+// Copyright (C) 2013-2018+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+// Package bindata stores core mcl code that is built-in at compile time.
+package bindata