MdeModulePkg RegularExpressionDxe: Update Oniguruma to 6.9.0

https://bugzilla.tianocore.org/show_bug.cgi?id=1200
Update Oniguruma to the latest version v6.9.0.
Oniguruma https://github.com/kkos/oniguruma
Verify VS2017, GCC5 build.
Verify RegularExpressionProtocol GetInfo() and Match() function.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Dongao Guo <dongao.guo@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Cinnamon Shia <cinnamon.shia@hpe.com>

MdeModulePkg/Universal/RegularExpressionDxe/Oniguruma/onig_init.c

@@ -0,0 +1,45 @@
+/**********************************************************************
+  onig_init.c -  Oniguruma (regular expression library)
+**********************************************************************/
+/*-
+ * Copyright (c) 2016-2018  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "regint.h"
+
+/* onig_init(): deprecated function */
+extern int
+onig_init(void)
+{
+#if 0
+  OnigEncoding encs[] = {
+    ONIG_ENCODING_UTF8
+  };
+
+  return onig_initialize(encs, sizeof(encs)/sizeof(encs[0]));
+#else
+  return onig_initialize(0, 0);
+#endif
+}