Fix specfile for RHEL5

RHEL5 uses an old libtool. We need to forcibly remove certain m4
files before running autoreconf to ensure that they get replaced
with the appropriate old versions.

contrib/sssd.spec.in

@@ -112,7 +112,17 @@ use with ldap_default_authtok_type = obfuscated_password.
 %setup -q
 
 %build
+
+# RHEL 5 uses an old libtool, so we need to force it to reconfigure
+# This is safe to do on newer packages too, as it will just
+# gather the appropriate m4 files from the libtool package
+for i in libtool.m4  lt~obsolete.m4  ltoptions.m4  ltsugar.m4  ltversion.m4
+do
+    find . -name $i -exec rm -f {} \;
+done
+
 autoreconf -ivf
+
 %configure \
     --with-db-path=%{dbpath} \
     --with-pipe-path=%{pipepath} \