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Use submodule way to access oniguruma. And upgrade oniguruma version from v6.9.3 to v6.9.4_mark1. REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2073 Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Hao A Wu <hao.a.wu@intel.com> Cc: Liming Gao <liming.gao@intel.com> Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>