Fix strncasecmp related compilation errors on MSVC

src/string.cpp

@@ -20,6 +20,11 @@
 #include <ctype.h> /* required for tolower() */
 #include <sstream>
 
+#ifdef _MSC_VER
+#	include <errno.h> // required by vsnprintf implementation for MSVC
+#	define strncasecmp strnicmp
+#endif
+
 #ifdef _WIN32
 #	include "os/windows/win32.h"
 #endif