[libmicrohttpd] Unique names for MD5 and SHA256 functions

[microhttpd]

Hi to all.

I updated to the latest version 0.9.63.
This version caused some trouble with duplicated symbols in the newly 
introduced hash methods sha256_init and sha256_update.
I want to ask if it is possible to use unique (MHD specific) names for them?

I attached a patch that introduce MHD_* as a preamble for the functions.
To have a consistent name convention, I also renamed the MD5 hash functions.

It would be great for the compatibilty with other hashing libraries if 
this suggestion could be applied.

Kind regards,
Dirk Brinkmeier.

rename-hash-funtions.patch
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