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This commit removes all the static occurrencies of the function
mbedtls_zeroize() in each of the individual .c modules. Instead the
function has been moved to utils.h that is included in each of the
modules.

A simple execution of tmp/invoke-rename.pl

All symmetric cipher algorithms and hash algorithms now include support
for a POLARSSL_XXX_ALT flag that prevents the definition of the
algorithm context structure and all 'core' functions.
(cherry picked from commit 4087c470)

(cherry picked from commit eae09db9)

Conflicts:
	library/gcm.c

 - Major type rewrite of int to size_t for most variables and arguments used for buffer lengths and loops