Silence a warning

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58563 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Win32/Host.inc b/lib/System/Win32/Host.inc
index f105b38..7bbf2bd 100644
--- a/lib/System/Win32/Host.inc
+++ b/lib/System/Win32/Host.inc
@@ -22,14 +22,16 @@
 }
 
 std::string sys::osVersion() {
-  OSVERSIONINFO osvi = { 0 };
+  OSVERSIONINFO osvi;
+
+  memset(&osvi, 0, sizeof(osvi));
   osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
 
   if (!GetVersionEx(&osvi))
     return "";
-  
-  char buf[64];
-  sprintf(buf, "%d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
 
-  return buf;  
+  char buf[64];
+  sprintf(buf, "%d.%d", (int)osvi.dwMajorVersion, (int)osvi.dwMinorVersion);
+
+  return buf;
 }