fixes to compile on MSVC again

src/os/win32/sigar_os.h

@@ -19,9 +19,18 @@
 #ifndef SIGAR_OS_H
 #define SIGAR_OS_H
 
+#if !defined(MSVC) && defined(_MSC_VER)
+#define MSVC
+#endif
+
 #ifdef MSVC
+#define WIN32_LEAN_AND_MEAN
+#define snprintf _snprintf
 #if _MSC_VER <= 1200
 #define SIGAR_USING_MSC6 /* Visual Studio version 6 */
+#define HAVE_MIB_IPADDRROW_WTYPE 0
+#else
+#define HAVE_MIB_IPADDRROW_WTYPE 1
 #endif
 #else
 /* Cross compiling */

src/os/win32/win32_sigar.c

@@ -23,7 +23,9 @@
 #include "sigar_util.h"
 #include "sigar_format.h"
 #include <shellapi.h>
+#ifndef MSVC
 #include <iphlpapi.h>
+#endif
 
 #define USING_WIDE_S(s) (s)->using_wide
 #define USING_WIDE()    USING_WIDE_S(sigar)