package/libselinux: replace PKG_PYTHON_DISTUTILS_ENV

Replace PKG_PYTHON_DISTUTILS_ENV by PKG_PYTHON_SETUPTOOLS_ENV as
libselinux uses setuptools instead of distutils since version 3.5 and
https://github.com/SELinuxProject/selinux/commit/2b5d5585754eb731a68158b613c7676fc3195ed9

This will avoid the following build failure raised since commit
09de823cbc7bd50a40e25f4166b4e42be94b0c7b:

In file included from /home/buildroot/autobuild/instance-0/output-1/per-package/libselinux/host/include/python3.12/Python.h:38,
                 from selinuxswig_python_wrap.c:168:
/home/buildroot/autobuild/instance-0/output-1/per-package/libselinux/host/include/python3.12/pyport.h:586:2: error: #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
  586 | #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
      |  ^~~~~

Fixes: 09de823cbc7bd50a40e25f4166b4e42be94b0c7b
Fixes: http://autobuild.buildroot.org/results/3fbbb741de33310c8cacab753a32e79c5e531036

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit c10349bf67c113444c9f9081b18cf15457f78d04)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libselinux/libselinux.mk

@@ -38,7 +38,7 @@ LIBSELINUX_DEPENDENCIES += \
 	host-swig
 
 LIBSELINUX_MAKE_OPTS += \
-	$(PKG_PYTHON_DISTUTILS_ENV) \
+	$(PKG_PYTHON_SETUPTOOLS_ENV) \
 	PYTHON=python$(PYTHON3_VERSION_MAJOR)
 
 LIBSELINUX_MAKE_INSTALL_TARGETS += install-pywrap
@@ -93,7 +93,7 @@ HOST_LIBSELINUX_MAKE_OPTS = \
 	$(HOST_CONFIGURE_OPTS) \
 	PREFIX=$(HOST_DIR) \
 	SHLIBDIR=$(HOST_DIR)/lib \
-	$(HOST_PKG_PYTHON_DISTUTILS_ENV) \
+	$(HOST_PKG_PYTHON_SETUPTOOLS_ENV) \
 	PYTHON=python$(PYTHON3_VERSION_MAJOR) \
 	USE_PCRE2=y