Update libxml to 2.7.7.

third_party/libxml/globals.c

Index: third_party/libxml/globals.c
diff --git a/third_party/libxml/globals.c b/third_party/libxml/globals.c
index cbc66253d14c05d61d4ba8dbbe1af11383cae00b..69002f007d0e6f2673a0454438262497fa9f5fb2 100644
--- a/third_party/libxml/globals.c
+++ b/third_party/libxml/globals.c
@@ -46,7 +46,8 @@ static xmlMutexPtr xmlThrDefMutex = NULL;
  */
 void xmlInitGlobals(void)
 {
-    xmlThrDefMutex = xmlNewMutex();
+    if (xmlThrDefMutex == NULL)
+        xmlThrDefMutex = xmlNewMutex();
 }
 
 /**
@@ -148,6 +149,7 @@ xmlStrdupFunc xmlMemStrdup = (xmlStrdupFunc) xmlStrdup;
 #undef	xmlGenericError
 #undef	xmlStructuredError
 #undef	xmlGenericErrorContext
+#undef	xmlStructuredErrorContext
 #undef	xmlGetWarningsDefaultValue
 #undef	xmlIndentTreeOutput
 #undef  xmlTreeIndentString
@@ -314,6 +316,13 @@ static xmlStructuredErrorFunc xmlStructuredErrorThrDef = NULL;
  */
 void *xmlGenericErrorContext = NULL;
 static void *xmlGenericErrorContextThrDef = NULL;
+/**
+ * xmlStructuredErrorContext:
+ *
+ * Global setting passed to structured error callbacks
+ */
+void *xmlStructuredErrorContext = NULL;
+static void *xmlStructuredErrorContextThrDef = NULL;
 xmlError xmlLastError;
 
 /*
@@ -545,6 +554,7 @@ xmlInitializeGlobalState(xmlGlobalStatePtr gs)
     gs->xmlGenericError = xmlGenericErrorThrDef;
     gs->xmlStructuredError = xmlStructuredErrorThrDef;
     gs->xmlGenericErrorContext = xmlGenericErrorContextThrDef;
+    gs->xmlStructuredErrorContext = xmlStructuredErrorContextThrDef;
     gs->xmlRegisterNodeDefaultValue = xmlRegisterNodeDefaultValueThrDef;
     gs->xmlDeregisterNodeDefaultValue = xmlDeregisterNodeDefaultValueThrDef;
 
@@ -573,7 +583,7 @@ xmlThrDefSetGenericErrorFunc(void *ctx, xmlGenericErrorFunc handler) {
 void
 xmlThrDefSetStructuredErrorFunc(void *ctx, xmlStructuredErrorFunc handler) {
     xmlMutexLock(xmlThrDefMutex);
-    xmlGenericErrorContextThrDef = ctx;
+    xmlStructuredErrorContextThrDef = ctx;
     xmlStructuredErrorThrDef = handler;
     xmlMutexUnlock(xmlThrDefMutex);
 }
@@ -876,6 +886,15 @@ __xmlGenericErrorContext(void) {
 	return (&xmlGetGlobalState()->xmlGenericErrorContext);
 }
 
+#undef	xmlStructuredErrorContext
+void * *
+__xmlStructuredErrorContext(void) {
+    if (IS_MAIN_THREAD)
+	return (&xmlStructuredErrorContext);
+    else
+	return (&xmlGetGlobalState()->xmlStructuredErrorContext);
+}
+
 #undef	xmlGetWarningsDefaultValue
 int *
 __xmlGetWarningsDefaultValue(void) {
@@ -910,7 +929,7 @@ int xmlThrDefIndentTreeOutput(int v) {
     return ret;
 }
 
-#undef xmlTreeIndentString
+#undef	xmlTreeIndentString
 const char * *
 __xmlTreeIndentString(void) {
     if (IS_MAIN_THREAD)