stored: use correct algorithm on FreeBSD

Fixes #1180: CRC checksum algorihm changed between 18.2.7 and 19.2.5

Previously crc32.cc did not detect when it couldn't
find out what endianess the machine was. This is now
fixed so that
1. FreeBSD detects endianess correctly
2. the compile fails when there is no __BYTE_ORDER

(cherry picked from commit ee0b908)

core/src/stored/crc32/crc32.cc

@@ -43,6 +43,23 @@
   #endif
 #endif
 
+#if not defined __BYTE_ORDER
+#  include <sys/endian.h>
+#  if defined _BYTE_ORDER && not defined __BYTE_ORDER
+#    define __BYTE_ORDER _BYTE_ORDER
+#  endif
+#  if defined _LITTLE_ENDIAN && not defined __LITTLE_ENDIAN
+#    define __LITTLE_ENDIAN _LITTLE_ENDIAN
+#  endif
+#  if defined _BIG_ENDIAN && not defined __BIG_ENDIAN
+#    define __BIG_ENDIAN _BIG_ENDIAN
+#  endif
+#endif
+
+#if not defined __BYTE_ORDER
+#error __BYTE_ORDER not set
+#endif
+
 
 /// zlib's CRC32 polynomial
 const uint32_t Polynomial = 0xEDB88320;