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/filesel.c

@@ -43,7 +43,10 @@
 #include <string.h>
 #ifdef _MSC_VER
 #include <stdio.h>
+#define strdup _strdup
+#if _MSC_VER < 1900
 #define snprintf _snprintf
+#endif
 #else
 #include <strings.h>
 #include <unistd.h>