scons: Use pip3 wheel & pip3 install instead of setup.py

Also introduce entities for pip3 wheel and pip3 install for future use
(#18466).  Reuse the entities for gpgme and libpwquality, so the missed
--no-user in libpwquality is fixed as well.

general.ent

@@ -203,3 +203,7 @@ export -f as_root</userinput></screen>
 
 <!ENTITY qt5-deps
          "(<xref linkend='qt5'/> or <xref role='nodep' linkend='qt5-alternate'/>)">
+
+<!ENTITY build-wheel '<screen><userinput>pip3 wheel -w dist --no-build-isolation --no-deps --no-cache-dir .</userinput></screen>'>
+
+<!ENTITY install-wheel 'pip3 install --no-index --find-links=dist --no-cache-dir --no-user'>

general/prog/scons.xml

@@ -79,19 +79,27 @@
   <sect2 role="installation">
     <title>Installation of SCons</title>
 
+    <!-- Commented out because I don't think it's still needed.  If
+         something bad happens please uncomment.
+    <screen><userinput>sed -i 's/env python/&amp;3/' SCons/Utilities/*.py &amp;&amp;</userinput></screen> -->
+
     <para>
-      Install <application>SCons</application> by running the following
-      commands as the <systemitem class="username">root</systemitem> user:
+      Fix the install location of the man pages:
     </para>
 
-<screen role="root"><userinput>sed -i 's/env python/&amp;3/' SCons/Utilities/*.py &amp;&amp;
+    <screen><userinput>sed -i '/scons.1/s@^.@share/man/man1@' -i setup.cfg</userinput></screen>
 
-python3 setup.py install --prefix=/usr \
-                         --optimize=1  &amp;&amp;
+    <para>
+      Build the package:
+    </para>
 
-mv -v /usr/lib/python&python3-majorver;/site-packages/SCons-&scons-version;-py&python3-majorver;.egg/*.1 \
-      /usr/share/man/man1</userinput></screen>
+    &build-wheel;
 
+    <para>
+      As the &root; user, install the package:
+    </para>
+
+    <screen role='root'><userinput>&install-wheel; SCons</userinput></screen>
   </sect2>
 
   <sect2 role="content">
@@ -110,7 +118,7 @@ mv -v /usr/lib/python&python3-majorver;/site-packages/SCons-&scons-version;-py&p
           None
         </seg>
         <seg>
-          /usr/lib/python&python3-majorver;/site-packages/SCons
+          /usr/lib/python&python3-majorver;/site-packages/SCons{,-&scons-version;.dist-info}
         </seg>
       </seglistitem>
     </segmentedlist>

postlfs/security/gpgme.xml

@@ -164,7 +164,7 @@ make -k check PYTHONS= PYTHON=$PWD/testenv/bin/python3</userinput></screen>
     </para>
 
 <screen role="root"><userinput>if swig -version > /dev/null; then
-  pip3 install --no-index --find-links=dist --no-cache-dir --no-user gpg
+  &install-wheel; gpg
 fi</userinput></screen>
 
   </sect2>

postlfs/security/libpwquality.xml

@@ -112,7 +112,7 @@ pip3 wheel -w dist --no-build-isolation --no-deps --no-cache-dir \
     </para>
 
 <screen role="root"><userinput>make install &amp;&amp;
-pip3 install --no-index --find-links=dist --no-cache-dir pwquality</userinput></screen>
+&install-wheel; pwquality</userinput></screen>
 
   </sect2>