lang: Unnested the core package from the functions dir

The core package could contain non-functions, so we might as well move
it upwards.

lang/core/sys/load_fact_darwin.go

@@ -0,0 +1,38 @@
+// Mgmt
+// Copyright (C) 2013-2024+ 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/>.
+
+//go:build darwin
+
+package coresys
+
+/*
+#include <stdlib.h>
+*/
+import "C"
+
+// macOS/Darwin specific implementation to get load.
+func load() (one, five, fifteen float64, err error) {
+	avg := []C.double{0, 0, 0}
+
+	C.getloadavg(&avg[0], C.int(len(avg)))
+
+	one = float64(avg[0])
+	five = float64(avg[1])
+	fifteen = float64(avg[2])
+
+	return
+}