libppd: upgrade 2.0.0 -> 2.1.1

This upgrade contains a fix for CVE-2024-47175.

Changelog:

2.1.1:
-pdftops: Use Poppler for a few old Epson laser printers This
 works around documents being printed off-centre, shifted towards
 the top right. Affected are printers using epsoneplijs:
 EPL-5700L, EPL-5800L, EPL-5900L, EPL-6100L, EPL-6200L.
-Fixed bugs discovered by static analyzer OpenScanHub Possible
 buffer overflows, uninitialized memory, format string issues
 and resource leaks, ...
-Fix crash bugs in ppdLoadAttributes() When parsing the
 "*cupsFilter(2): ..." lines in the PPD file use memmove() instead
 of strcpy() as the latter does not support handling overlapping
 memory portions and do not move running pointer beyond the end
 of the input string.

2.1.0:
-Prevent PPD generation based on invalid IPP response Overtaken
 from CUPS 2.x: Validate IPP attributes in PPD generator, refactor
 make-and-model code, PPDize preset and template names, quote PPD
 localized strings. Fixes CVE-2024-47175.

2.1b:
-Added support for libcups3 (libcups of CUPS 3.x) With these changes
 libcupsfilters can be built either with libcups2 (libcups of CUPS 2.x)
 or libcups3 (libcups of CUPS 3.x).
-Prefer PDF again in PPDs for driverless printers PDF works better with
 finishing, especially combinations of multiple copies, collation, and
 stapling/binding.
-Use 0.5mm as tolerance when comparing page sizes For the PWG two page
 sizes are considered the same when the dimensions differ no more than
 0.5 mm, libppd used too tight tolerances.
-PPD generator: Check for required attributes when choosing input format
 Check for PCLm and PWG the minimum of attributes which we require
 during PPD generation.
-ppdLoadAttributes(): Improve check whether parameters are integer
-ppdLoadAttributes(): Fix crash when page size could not get determined
-Fix crash if there is no page size for "Custom"
-Fix crash when incoming *ptr is NULL
-libcups2 compatibility: Use proper CUPS array callback function types
 Fixed CUPS array function call in libcups2 compatibility layer
-Build system: Fix failure to correctly link to zlib Look up zlib
 properly with pkg-config

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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