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NetworkManager-l2tp依赖指定版本的ppp包

Requires: ppp = %{ppp_version}

ppp版本从编译环境中过滤pppd的头文件所得，失败则显示版本号为bad

%global ppp_version %(sed -n 's/^#define\\s*VERSION\\s*"\\([^\\s]*\\)"$/\\1/p' %{_includedir}/pppd/patchlevel.h 2>/dev/null | grep . || 
echo bad)

ppp包升级到2.5.0版本后，不再提供patchlevel.h文件，因此版本号过滤失败

建议解决方案：
修改ppp版本号过滤方法为：

%global ppp_version %(pkg-config --modversion pppd 2>/dev/null || sed -n 's/^#define\\s*VERSION\\s*"\\([^\\s]*\\)"$/\\1/p' %{_includedir}/pppd/patchlevel.h 2>/dev/null | grep . || echo bad)