Update expat to 2.2.0 to fix CVE vulnerability.

third_party/expat/files/lib/expat_config.h

Index: third_party/expat/files/lib/expat_config.h
diff --git a/third_party/expat/files/lib/expat_config.h b/third_party/expat/files/lib/expat_config.h
index d5971ef724179fec558cbc3b5ba8d802da6798f0..1eaa22aee501df06d993b68883c2018eae35fcdb 100644
--- a/third_party/expat/files/lib/expat_config.h
+++ b/third_party/expat/files/lib/expat_config.h
@@ -1,10 +1,10 @@
 // No copyright notice; this file based on autogenerated header
 
-#ifndef THIRD_PARTY_EXPAT_V2_0_1_SOURCE_LIB_EXPAT_CONFIG_H__
-#define THIRD_PARTY_EXPAT_V2_0_1_SOURCE_LIB_EXPAT_CONFIG_H__
+#ifndef THIRD_PARTY_EXPAT_V2_2_0_SOURCE_LIB_EXPAT_CONFIG_H__
+#define THIRD_PARTY_EXPAT_V2_2_0_SOURCE_LIB_EXPAT_CONFIG_H__
 
 /* expat_config.h.  Generated from expat_config.h.in by configure.  */
-/* expat_config.h.in.  Generated from configure.in by autoheader.  */
+/* expat_config.h.in.  Generated from configure.ac by autoheader.  */
 
 /* 1234 = LIL_ENDIAN, 4321 = BIGENDIAN */
 #define BYTEORDER 1234
@@ -57,8 +57,7 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #define HAVE_UNISTD_H 1
 
-/* Define to the sub-directory in which libtool stores uninstalled libraries.
-   */
+/* Define to the sub-directory where libtool stores uninstalled libraries. */
 #define LT_OBJDIR ".libs/"
 
 /* Define to the address where bug reports for this package should be sent. */
@@ -68,7 +67,7 @@
 #define PACKAGE_NAME "expat"
 
 /* Define to the full name and version of this package. */
-#define PACKAGE_STRING "expat 2.1.0"
+#define PACKAGE_STRING "expat 2.2.0"
 
 /* Define to the one symbol short name of this package. */
 #define PACKAGE_TARNAME "expat"
@@ -77,7 +76,7 @@
 #define PACKAGE_URL ""
 
 /* Define to the version of this package. */
-#define PACKAGE_VERSION "2.1.0"
+#define PACKAGE_VERSION "2.2.0"
 
 /* Define to 1 if you have the ANSI C header files. */
 #define STDC_HEADERS 1
@@ -107,4 +106,4 @@
 /* Define to `unsigned int' if <sys/types.h> does not define. */
 /* #undef size_t */
 
-#endif  // THIRD_PARTY_EXPAT_V2_0_1_SOURCE_LIB_EXPAT_CONFIG_H__
+#endif  // THIRD_PARTY_EXPAT_V2_2_0_SOURCE_LIB_EXPAT_CONFIG_H__