systemd change release and add O2 compiling

Signed-off-by: basebuilder_pel7x64builder0 <basebuilder@powerel.org>

SPECS/systemd.spec

@@ -3,6 +3,7 @@
 # directory.
 %global __requires_exclude pkg-config
 %global _hardened_build 1
+%global optflags %(echo %{optflags} | sed 's/-O3/-O2/')
 
 Name:           systemd
 Url:            http://www.freedesktop.org/wiki/Software/systemd
@@ -755,7 +756,7 @@ Requires(pre):  /usr/sbin/groupadd
 Requires:       dbus
 Requires:       %{name}-libs = %{version}-%{release}
 Requires:       kmod >= 18-4
-Requires:       redhat-release >= 7.0
+Requires:       powerel-release >= 7
 Requires:       diffutils
 
 Provides:       /bin/systemctl