Created custom functions to convert (h)words to and from bytecode format

Instead of using endian.h that is not portable AND doesn't work with
C++, I'll just write my own using a forced union based type punning
trick.

I've decided to use little endian for the format as well: it seems to
be used by most desktop computers so it should make these functions
faster to run for most CPUs.

lib/base.h

@@ -13,8 +13,6 @@
 #ifndef BASE_H
 #define BASE_H
 
-#define _DEFAULT_SOURCE
-#include <endian.h>
 #include <stdint.h>
 
 /* Basic macros for a variety of uses.  Quite self explanatory. */
@@ -130,4 +128,21 @@ word convert_bytes_to_word(byte *);
  */
 void convert_word_to_bytes(word w, byte *buffer);
 
+/** Convert a half word into bytecode format (little endian)
+ */
+hword hword_htobc(hword);
+
+/** Convert a half word in bytecode format (little endian) to host
+ * format
+ */
+hword hword_bctoh(hword);
+
+/** Convert a word into bytecode format (little endian)
+ */
+word word_htobc(word);
+
+/** Convert a word in bytecode format (little endian) to host format
+ */
+word word_bctoh(word);
+
 #endif