Makefile.am: move the man page rules to the top

More readable grouping this way

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
7 jobs for wip/reorder-makefile in 1 minute and 51 seconds
Status Name Job ID Coverage
  Prep
passed container-prep #7868215

00:00:21

 
  Build
passed autotools: [] #7868218

00:01:16

passed autotools: [--enable-legacy] #7868219

00:01:15

passed meson: [] #7868216

00:00:16

passed meson: [-Dlegacy=true] #7868217

00:00:16

 
  Test
passed check evdev keysyms #7868221

00:00:10

passed meson from tarball #7868220

00:00:13