meson, man: do not install pam_systemd_home(8) when pam or homed is disabled

Fixes #14725.

man/pam_systemd_home.xml

@@ -3,7 +3,7 @@
   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
 <!-- SPDX-License-Identifier: LGPL-2.1+ -->
 
-<refentry id="pam_systemd_home" conditional='HAVE_PAM'>
+<refentry id="pam_systemd_home" conditional='ENABLE_PAM_HOME'>
 
   <refentryinfo>
     <title>pam_systemd_home</title>

man/rules/meson.build

@@ -46,7 +46,7 @@ manpages = [
  ['nss-systemd', '8', ['libnss_systemd.so.2'], 'ENABLE_NSS_SYSTEMD'],
  ['os-release', '5', [], ''],
  ['pam_systemd', '8', [], 'HAVE_PAM'],
- ['pam_systemd_home', '8', [], 'HAVE_PAM'],
+ ['pam_systemd_home', '8', [], 'ENABLE_PAM_HOME'],
  ['portablectl', '1', [], 'ENABLE_PORTABLED'],
  ['pstore.conf', '5', ['pstore.conf.d'], 'ENABLE_PSTORE'],
  ['repart.d', '5', [], 'ENABLE_REPART'],

meson.build

@@ -1343,6 +1343,9 @@ else
 endif
 conf.set10('ENABLE_HOMED', have)
 
+have = have and conf.get('HAVE_PAM') == 1
+conf.set10('ENABLE_PAM_HOME', have)
+
 want_remote = get_option('remote')
 if want_remote != 'false'
         have_deps = [conf.get('HAVE_MICROHTTPD') == 1,