Update zfs.spec.in to reference updated README.markdown file

The spec file references the README by the previous name which
has changed to make it github friendly.  This results in an
rpm build failure.

Makefile.am

@@ -11,7 +11,7 @@ SUBDIRS = $(USER_DIR) $(KERNEL_DIR)
 AUTOMAKE_OPTIONS = foreign dist-zip
 EXTRA_DIST  = autogen.sh config/config.awk
 EXTRA_DIST += zfs.spec.in zfs-modules.spec.in
-EXTRA_DIST += META DISCLAIMER COPYRIGHT GIT
+EXTRA_DIST += META DISCLAIMER COPYRIGHT GIT README.markdown
 EXTRA_DIST += OPENSOLARIS.LICENSE ZFS.RELEASE
 noinst_HEADERS = zfs_config.h
 

zfs.spec.in

@@ -60,7 +60,7 @@ rm -rf $RPM_BUILD_ROOT
 %files
 %defattr(-, root, root)
 %doc AUTHORS ChangeLog COPYING COPYRIGHT DISCLAIMER
-%doc GIT OPENSOLARIS.LICENSE README ZFS.RELEASE
+%doc GIT OPENSOLARIS.LICENSE README.markdown ZFS.RELEASE
 %{_sbindir}/*
 %{_bindir}/*
 %{_libdir}/*