rpm: fix openmpi.spec not to include the /usr directory

/usr cannot be included on RHEL7 like distros

(back ported from commit open-mpi/ompi@6ab3289)

Author: ggouaillardet

contrib/dist/linux/openmpi.spec

@@ -12,6 +12,8 @@
 # Copyright (c) 2006-2014 Cisco Systems, Inc.  All rights reserved.
 # Copyright (c) 2013      Mellanox Technologies, Inc.
 #                         All rights reserved.
+# Copyright (c) 2015      Research Organization for Information Science
+#                         and Technology (RIST). All rights reserved.
 # $COPYRIGHT$
 # 
 # Additional copyrights may follow
@@ -672,7 +674,14 @@ test "x$RPM_BUILD_ROOT" != "x" && rm -rf $RPM_BUILD_ROOT
 
 %files
 %defattr(-, root, root, -)
+%if %(test "%{_prefix}" = "/usr" && echo 1 || echo 0)
+%{_bindir}/*
+%{_includedir}/*
+%{_libdir}/*
+%{_datadir}
+%else
 %{_prefix}
+%endif
 # If the sysconfdir is not under the prefix, then list it explicitly.
 %if !%{sysconfdir_in_prefix}
 %{_sysconfdir}
@@ -708,7 +717,13 @@ test "x$RPM_BUILD_ROOT" != "x" && rm -rf $RPM_BUILD_ROOT
 
 %files runtime -f runtime.files
 %defattr(-, root, root, -)
-%dir %{_prefix}
+%if %(test "%{_prefix}" = "/usr" && echo 1 || echo 0)
+%{_bindir}/*
+%{_libdir}/*
+%{_datadir}
+%else
+%{_prefix}
+%endif
 # If the sysconfdir is not under the prefix, then list it explicitly.
 %if !%{sysconfdir_in_prefix}
 %{_sysconfdir}
@@ -731,9 +746,6 @@ test "x$RPM_BUILD_ROOT" != "x" && rm -rf $RPM_BUILD_ROOT
 %{shell_scripts_path}/%{shell_scripts_basename}.sh
 %{shell_scripts_path}/%{shell_scripts_basename}.csh
 %endif
-%dir %{_bindir}
-%dir %{_libdir}
-%dir %{_libdir}/openmpi
 %doc README INSTALL LICENSE
 %{_pkgdatadir}
 
@@ -758,6 +770,9 @@ test "x$RPM_BUILD_ROOT" != "x" && rm -rf $RPM_BUILD_ROOT
 #
 #############################################################################
 %changelog
+* Thu Nov 12 2015 Gilles Gouaillardet <[email protected]>
+- Revamp packaging when prefix is /usr
+
 * Mon Jul 07 2014 Jeff Squyres <[email protected]>
 - Several minor fixes from Oliver Lahaye: fix dates in changelog,
   added %{?dist} tag to the Release field, and added some Provides