include: Remove unnecessary includes

- Don't include tree.h from encoding.h
- Don't include parser.h from xmlIO.h

encoding.c

@@ -34,6 +34,7 @@
 
 #include <libxml/encoding.h>
 #include <libxml/xmlmemory.h>
+#include <libxml/parser.h>
 #ifdef LIBXML_HTML_ENABLED
 #include <libxml/HTMLparser.h>
 #endif

include/libxml/encoding.h

@@ -151,14 +151,6 @@ struct _xmlCharEncodingHandler {
 #endif /* LIBXML_ICU_ENABLED */
 };
 
-#ifdef __cplusplus
-}
-#endif
-#include <libxml/tree.h>
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /*
  * Interfaces for encoding handlers.
  */
@@ -203,20 +195,21 @@ XMLPUBFUN xmlCharEncoding
 	xmlDetectCharEncoding		(const unsigned char *in,
 					 int len);
 
+struct _xmlBuffer;
 XMLPUBFUN int
 	xmlCharEncOutFunc		(xmlCharEncodingHandler *handler,
-					 xmlBufferPtr out,
-					 xmlBufferPtr in);
+					 struct _xmlBuffer *out,
+					 struct _xmlBuffer *in);
 
 XMLPUBFUN int
 	xmlCharEncInFunc		(xmlCharEncodingHandler *handler,
-					 xmlBufferPtr out,
-					 xmlBufferPtr in);
+					 struct _xmlBuffer *out,
+					 struct _xmlBuffer *in);
 XML_DEPRECATED
 XMLPUBFUN int
 	xmlCharEncFirstLine		(xmlCharEncodingHandler *handler,
-					 xmlBufferPtr out,
-					 xmlBufferPtr in);
+					 struct _xmlBuffer *out,
+					 struct _xmlBuffer *in);
 XMLPUBFUN int
 	xmlCharEncCloseFunc		(xmlCharEncodingHandler *handler);
 

include/libxml/xmlIO.h

@@ -13,6 +13,7 @@
 #include <stdio.h>
 #include <libxml/xmlversion.h>
 #include <libxml/encoding.h>
+#include <libxml/tree.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -140,16 +141,6 @@ typedef xmlOutputBufferPtr
 (*xmlOutputBufferCreateFilenameFunc)(const char *URI,
         xmlCharEncodingHandlerPtr encoder, int compression);
 
-#ifdef __cplusplus
-}
-#endif
-
-#include <libxml/tree.h>
-#include <libxml/parser.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
 struct _xmlParserInputBuffer {
     void*                  context;
     xmlInputReadCallback   readcallback;