Fix bug #47925 again (#14348)

The naming of the userland functions is terrible and confused me.
gzdecode() is actually the function to decompress a gzip stream, and
gzuncompress() is

Fix bug #47925 again (#14348)

The naming of the userland functions is terrible and confused me.
gzdecode() is actually the function to decompress a gzip stream, and
gzuncompress() is the one to decompress a deflate stream...
See zlib.c to see the internal function -> type mapping.

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Fix bug #47925: PHPClient can't decompress response (transposed uncompress methods?)

The incorrect functions are being called to deal with incoming
compressed data.
gzip/x-gzip corre

Fix bug #47925: PHPClient can't decompress response (transposed uncompress methods?)

The incorrect functions are being called to deal with incoming
compressed data.
gzip/x-gzip corresponds to gzuncompress(), while deflate corresponds to
gzinflate().

The existing code for gzip compression also plays with removing the
first 10 bytes (i.e. the gzip header) to pass it to the inflate
implementation but that doesn't always work properly due to trailer
data. Get rid of that entirely by using the correct functions.

Closes GH-14321.

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