fix windows build scripts, add windows opus support

tier0/memstd.cpp

@@ -666,7 +666,7 @@ int CSmallBlockPool::CountFreeBlocks()
 // Size of committed memory managed by this heap:
 int CSmallBlockPool::GetCommittedSize()
 {
-	unsigned totalSize = (unsigned)m_pCommitLimit - (unsigned)m_pBase;
+	unsigned totalSize = (uintp)m_pCommitLimit - (uintp)m_pBase;
 	Assert( 0 != m_nBlockSize );
 
 	return totalSize;

tier0/wscript

@@ -56,6 +56,10 @@ def build(bld):
 			'vcrmode.cpp',
 			'win32consoleio.cpp'
 		]
+		if bld.env.DEST_CPU == 'amd64':
+			source += [
+				'InterlockedCompareExchange128.masm'
+			]
 	else:
 		source += [
 			'cpu_posix.cpp',