zlib: update to 1.3.2

zlib: update to 1.3.2

Release Notes:
https://github.com/madler/zlib/blob/v1.3.2/ChangeLog

We also switch package tarball source to GitHub repository releases
to avoid package hash mismatch after the zstd upgrade.

The 005-* patch was suppressed by the upstream commit 15ba5055a935
("CMake: Adapt pkgconfig-file to the GnuInstallDirs layout.")

This patch also adjust the zlib.pc file path as it was changed in
the latest release.

The mipsel_24kc 'zlib' package size will increase by about 1 kB.

Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/21228
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>