Added LFS_LITTLER for disabling non-essential/debugging utils

This is a simple alias for a number of existing defines:

  LFS_LITTLER => LFS_NO_DEBUG
                 LFS_NO_INFO
                 LFS_NO_WARN
                 LFS_NO_ERROR
                 LFS_NO_ASSERT

This is mainly to make CI/code measurements easier. I suspect most
systems already make these zero (or at least minimal) cost in release
mode, but when building with our Makefile we need some way to disable
the simple printf/assert mapping.

This probably deserves a better name, but at least this is something.

Author: geky

lfs_util.h

@@ -20,6 +20,22 @@
 #include LFS_STRINGIZE(LFS_CONFIG)
 #else
 
+
+// Some convenient macro aliases
+// TODO move these to something like lfs_cfg.h?
+
+// LFS_LITTLER disables non-essential/debugging utils
+//
+// note your system may already make these zero cost in release mode
+#ifdef LFS_LITTLER
+#define LFS_NO_DEBUG
+#define LFS_NO_INFO
+#define LFS_NO_WARN
+#define LFS_NO_ERROR
+#define LFS_NO_ASSERT
+#endif
+
+
 // System includes
 #include <stdint.h>
 #include <stdbool.h>