If the prebuild/postbuild script statement start with double quotations, current tool report error, while DSC spec allow this usage. so update tool to support it. Cc: Liming Gao <liming.gao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>