Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxml/patches/xmlregexp-bogus-cast

Index: third_party/libxml/patches/xmlregexp-bogus-cast
diff --git a/third_party/libxml/patches/xmlregexp-bogus-cast b/third_party/libxml/patches/xmlregexp-bogus-cast
deleted file mode 100644
index aaebfaa69e6a572b0335876edc008cd9567c1107..0000000000000000000000000000000000000000
--- a/third_party/libxml/patches/xmlregexp-bogus-cast
+++ /dev/null
@@ -1,15 +0,0 @@
-Change bogus '(unsigned long)' cast to '(unsigned short)'
-
-Index: libxml/xmlregexp.c
-===================================================================
---- libxml.orig/xmlregexp.c	2010-07-09 14:16:36.990430641 -0700
-+++ libxml/xmlregexp.c	2010-07-09 14:16:40.939742007 -0700
-@@ -6470,7 +6470,7 @@
-     if (name != NULL) {
- 	value += 30 * (*name);
- 	while ((ch = *name++) != 0) {
--	    value = value ^ ((value << 5) + (value >> 3) + (unsigned long)ch);
-+	    value = value ^ ((value << 5) + (value >> 3) + (unsigned short)ch);
- 	}
-     }
-     return (value);