Replace <> with "" in ls.c

I don't know if it makes any different in C in general, but MSVC is a
special compiler. Maybe this will fix the build.

examples/ls.c

@@ -5,7 +5,7 @@
 
 #ifdef _WIN32
 #    define MINIRENT_IMPLEMENTATION
-#    include <minirent.h>
+#    include "minirent.h"
 #else
 #    include <dirent.h>
 #endif // _WIN32