By default newlib will disable syscalls for MPS430, which means defunct puts(),
printf(), etc. Since providing those is the main purpose of a standard c lib,
this makes little sense.

This enable syscalls again. With it, MCU operating systems such as RIOT can
provide functioning puts, printf(), read(), write(), etc.
--- a/newlib/configure.host
+++ b/newlib/configure.host
@@ -781,6 +781,9 @@
 	default_newlib_io_long_long="yes"
 	newlib_cflags="${newlib_cflags} -Os -DPREFER_SIZE_OVER_SPEED -DSMALL_MEMORY"
         ;;
+  msp430*)
+	syscall_dir=syscalls
+    ;;
   nios2*)
 	syscall_dir=
 	newlib_cflags="${newlib_cflags} -DHAVE_RENAME -DHAVE_SYSTEM -DMISSING_SYSCALL_NAMES"