The pcardext Python extension cannot be loaded because it has not been
ported to Python 3:

>>> import pcardext
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /usr/lib64/python3.11/site-packages/pcardext.so: undefined symbol: PyString_AsStringAndSize
>>>

Stop building this extension because it breaks the build if the
compiler lacks support for implicit function declarations.

Bug: <https://bugzilla.redhat.com/show_bug.cgi?id=2148210>

Submitted upstream: <https://bugs.launchpad.net/hplip/+bug/1997875>

diff --git a/Makefile.am b/Makefile.am
index ddac16a9dd514008..15d953af9150c09e 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -306,13 +306,6 @@ if !HPLIP_CLASS_DRIVER
 pcarddir = $(hplipdir)/pcard
 dist_pcard_DATA = pcard/__init__.py pcard/photocard.py
 
-# pcardext
-pcardextdir = $(pyexecdir)
-pcardext_LTLIBRARIES = pcardext.la
-pcardext_la_LDFLAGS = -module -avoid-version
-pcardext_la_SOURCES = pcard/pcardext/pcardext.c pcard/fat.c pcard/pcardext/pcardext.h
-pcardext_la_CFLAGS = -I$(PYTHONINCLUDEDIR)
-
 # prnt
 prntdir = $(hplipdir)/prnt
 dist_prnt_DATA = prnt/cups.py prnt/__init__.py prnt/ldl.py prnt/pcl.py prnt/colorcal.py