samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/gvarfault.t

@@ -0,0 +1,24 @@
+if require("ffi").os == "Windows" then
+	print("Disabled on windows (uses unistd.h)")
+	return
+end
+local C = terralib.includecstring(
+[[
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+]]
+)
+
+local gstr = global(&int8, "some text")
+
+terra fun1()
+    C.printf("gstr: %s \n", gstr)
+    return 0
+end
+
+fun1:printpretty()
+
+fun1()