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Change type of input data to const void *, for this function and
write_file.

The new name doesn't include the minor number and thus
allows to replace with a minor update of the library.

This addresses build issue when compiling with --enable-mini-gmp
and the symbol script being used.

This allows running the test suite under address sanitizer and undefined
sanitizer.

This corrects issues of the following type caught with -fsanitize=undefined
des.c:176:42: runtime error: index 42 out of bounds for type 'int8_t [26][4]'

Fixes crash reported by Hanno Böck.