Build: do not compress manual pages at install time

At the time of this writting
https://fedoraproject.org/wiki/Packaging:Guidelines#Manpages
says this:
  When installing man pages, note that they should be installed uncompressed
  as the build system will compress them as needed. The compression method
  may change, so it is important to reference the pages in the %files section
  with a pattern that takes this into account:
  %{_mandir}/man1/foo.1*

Removing the compression also allows to remove several install-data-hook
targets from Makefile.am files.

https://fedorahosted.org/freeipa/ticket/6418

Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>

ipatests/man/Makefile.am

@@ -10,9 +10,6 @@ dist_man1_MANS =            \
 	ipa-test-task.1     \
 		$(NULL)
 
-install-data-hook:
-	@for i in $(man1_MANS) ; do gzip -f $(DESTDIR)$(man1dir)/$$i ; done
-
 MAINTAINERCLEANFILES =      \
 	Makefile.in             \
 	$(NULL)