Build failure on big endian platforms (e.g. IBM Z/s390x)

[tobiasbrunner]

The #ifdef around ByteReverseWords that was added with cebb283 and released with 4.5.0 breaks the build on big endian platforms (e.g. on s390x on Travis CI, see here):

wolfcrypt/src/md5.c: In function ‘wc_Md5Update���:
wolfcrypt/src/md5.c:378:13: error: implicit declaration of function ‘ByteReverseWords’; did you mean ‘ByteReverseWords64’? [-Werror=implicit-function-declaration]
             ByteReverseWords(md5->buffer, md5->buffer, WC_MD5_BLOCK_SIZE);
             ^~~~~~~~~~~~~~~~
             ByteReverseWords64
wolfcrypt/src/md5.c:378:13: error: nested extern declaration of ‘ByteReverseWords’ [-Werror=nested-externs]

[kaleb-himes]

@tmael,

Can you review the changes here: cebb283#diff-4be40df89ec617072a3441685b231559R123-R134

Thanks!

• KH

[tmael]

Hi @tobiasbrunner and @kaleb-himes,

I've opened PR #3255 to fix the issue.

Thanks

[tobiasbrunner]

I successfully tested e9b1cea. Thanks!