samples: add Terra samples

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

samples/Terra/strerror.t

@@ -0,0 +1,9 @@
+string=terralib.includec("string.h")
+buf=terralib.new(int8[1024])
+ffi = require "ffi"
+if ffi.os == "Windows" then
+	string.strerror_s(buf,1024,1)
+else
+	string.strerror_r(1,buf,1024)
+end
+print(ffi.string(buf))