[contrib] Add freestanding translator prototype

This is the idea, some of the functionality isn't yet implemented.

contrib/freestanding_lib/test/Makefile

@@ -0,0 +1,27 @@
+# ################################################################
+# Copyright (c) 2015-2020, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under both the BSD-style license (found in the
+# LICENSE file in the root directory of this source tree) and the GPLv2 (found
+# in the COPYING file in the root directory of this source tree).
+# You may select, at your option, one of the above-listed licenses.
+# ################################################################
+
+all: run-test
+
+.PHONY: libzstd
+libzstd: clean
+	../freestanding.py --source-lib ../../../lib --output-lib ./libzstd
+
+
+test: libzstd
+	$(CC) $(CFLAGS) $(CPPFLAGS) -ffreestanding $(wildcard libzstd/*/*.c) -c
+	$(CC) $(CFLAGS) $(CPPFLAGS) -ffreestanding -c test.c
+	$(CC) $(LDFLAGS) -ffreestanding -nostdlib *.o -o test
+
+run-test: test
+	./test
+
+clean:
+	rm -rf ./libzstd/ *.o test