Combine linux and BSD endian code

endian.c

@@ -10,19 +10,21 @@ void xle64enc(uint8_t *d, uint64_t n) {
     OSWriteLittleInt64(d, 0, n);
 }
 
+#elif defined(__linux__) || defined(__FreeBSD__)
 
-#elif defined(__linux__)
-
-#define _BSD_SOURCE
 #include <stdint.h>
-#include <asm/byteorder.h>
+#ifdef __linux__
+	#include <endian.h>
+#else
+	#include <sys/endian.h>
+#endif
 
 uint64_t xle64dec(const uint8_t *d) {
-    return __le64_to_cpu(*(uint64_t*)d);
+    return le64toh(*(uint64_t*)d);
 }
 
 void xle64enc(uint8_t *d, uint64_t n) {
-    *(uint64_t*)d = __cpu_to_le64(n);
+    *(uint64_t*)d = htole64(n);
 }
 
 #else