build: outdated autotools helper config.* files in dist tarfile

Our jenkins release task clones the source, runs ./autogen.sh (where
config.{guess,sub} come from) and ./configure, before running `make
dist` to product the release glusterfs-X.Y.Z.tar.gz.

The config.{guess,sub} in the tar file come from the archaic autoconf
in CentOS 6.3, which is what the glusterfs jenkins is running on.

We should not be shipping the (arbitrary, old) config.{guess,sub} files
from our jenkins machine.

Change-Id: Ib7643ae2e54d0e25c95f4e93e5dffb22cbe11523
BUG: 1223937
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/11009
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>

Makefile.am

@@ -41,6 +41,7 @@ dist-hook: gen-VERSION gen-ChangeLog
 	-rm -fr $(distdir)/contrib/argp-standalone/autom4te.cache
 	-rm -fr $(distdir)/contrib/argp-standalone/.deps
 	-rm -fr $(distdir)/contrib/umountd/.deps
+	-rm -fr $(distdir)/config.{guess,sub}
 
 .PHONY: gen-VERSION gen-ChangeLog
 

glusterfs.spec.in

@@ -571,10 +571,7 @@ This package provides the translators needed on any GlusterFS client.
 %setup -q -n %{name}-%{version}%{?prereltag}
 
 %build
-# For whatever reason, install-sh is sometimes missing. When this gets fixed,
-# there is no need to run ./autogen or have a BuildRequires for automake.
-[ -e 'install-sh' -o -e 'install.sh' ] || ./autogen.sh
-%configure \
+./autogen.sh && %configure \
         %{?_with_tmpfilesdir} \
         %{?_without_rdma} \
         %{?_without_epoll} \