Warning fixes for VS .NET.

src/osgPlugins/txp/trpage_warchive.cpp

@@ -1368,7 +1368,7 @@ bool trpgwImageHelper::WriteToArchive(const trpgTexture &tex,char *data,trpgwApp
 
 	// Get the current address
 	addr.file = texFileIDs[texFileIDs.size()-1];
-	addr.offset = texFile->Pos();
+	addr.offset = static_cast<int32>(texFile->Pos());
 
 	// Write the data out to the archive.
 	int totSize = tex.CalcTotalSize();

src/osgPlugins/txp/trpage_writebuf.cpp

@@ -131,7 +131,7 @@ void trpgMemWriteBuffer::Add(int32 val)
 void trpgMemWriteBuffer::Add(int64 val)
 {
 	if (ness != cpuNess)
-		val = trpg_byteswap_long(val);
+		val = trpg_byteswap_llong(val);
 	append(sizeof(int64),(const char *)&val);
 }