fixes for MSVC non-standard C library

strcase => _stricmp
strncase => _strnicmp
strdup => _strdup
snprintf => _snprintf

a compliant snprintf() is supposed to be available
in MS Visual Studio 2015 and later

src/init.c

@@ -35,7 +35,6 @@
 #endif
 
 #include <stdio.h>
-//#include <fcntl.h>
 #include <string.h>
 
 #if !defined(__VBCC__) && !defined(_MSC_VER)
@@ -58,10 +57,13 @@
 #ifdef GRAFX2_CATCHES_SIGNALS
   #include <signal.h>
 #endif
-#ifdef _MSC_VER
-#include <stdio.h>
+#if defined(_MSC_VER)
+#define strncasecmp _strnicmp
+#define strdup _strdup
+#if _MSC_VER < 1900
 #define snprintf _snprintf
 #endif
+#endif
 
 #include "buttons.h"
 #include "const.h"