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crc32_combine_gen, export 32-bit and 64-bit versions for zlib-compatible api and only 64-bit version (without 64 suffix) for zlib-ng native api.
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These functions allow zlib-ng callers to modify and query the
compression parameters in a future-proof way. When the caller requests a
parameter, which is not supported by the current zlib-ng version, this
situation is detected and reported to the caller. The caller may modify
or query multiple parameters at once. Currently only "level" and
"strategy" parameters are supported. It is planned to add a
"reproducible" parameter, which would affect whether IBM Z DEFLATE
CONVERSION CALL is used.
Passing enum and void * buffer was chosen over passing strings, because
of simplicity for the caller. If strings were used, C callers would have
to call snprintf() and strtoul() for setting and getting integer-valued
parameters respectively, which is quite tedious.
Bulk updates were chosen over updating individual parameters separately,
because it might make sense to apply some parameters atomically, e.g.
level and strategy.
The new functions are defined only for zlib-ng, but not compat zlib.
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When the same len2 is used repeatedly, it is faster to use
crc32_combine_gen() to generate an operator, that is then used to
combine CRCs with crc32_combine_op().
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If zlib-compat is enabled, keep libz name.
If zlib-compat is disabled, use libz-ng name.
Add new .map file for -ng mode, with prefixed function names.
This commit only containes preparatory changes to
the central parts of the build system.
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