Build docs on 64-bit architectures only

In the light of the recent discussion about dropping i686 packages, let's stop
building our docs there. This reduces the amount of tools needed in the mock
root.

Unfortunately we need to move the man page out of the noarch ukify subpackage,
because it needs to be the same on all architectures where it is built.

split-files.py

@@ -121,7 +121,7 @@ for file in files(buildroot):
         o = outputs['rpm-macros']
     elif '/usr/lib/systemd/tests' in n:
         o = outputs['tests']
-    elif 'ukify' in n:
+    elif 'ukify' in n and '/man/' not in n:
         o = outputs['ukify']
     elif re.search(r'/libsystemd-core-.*\.so$', n):
         o = outputs['main']

systemd.spec

@@ -24,7 +24,8 @@
 %bcond bootstrap 0
 %bcond tests     1
 %bcond lto       1
-%bcond docs      1
+# Build docs on 64-bit architectures only
+%bcond docs      %[%{?__isa_bits} >= 64]
 
 # Build from git main
 %bcond upstream  0