Tidying the core_basic_window.c in projects/scripts (#2025)

* Match build-windows.bat changes

The location for manual setting of the vcvarsall.bat location moved to line 38 in the latest change.

* Update flags for clean x64/x86 building

std:c11 is required for initialization features used in raylib.  UTF-8 for consistency in contemporary systems.  /W3 gets rid of puzzling slack byte and linker in-lining warnings.  /sdl for some insecure library usages in the user code that beginners should learn about early.

* 2021-10-01 core_basic_windows.c adjustment

 1. The press F6 message and the placement of the compiled executable statement are incorrect for the scripts case.
 2. <raylib.h> because "raylib.h" is meaningful only when compiling inside raylib/src/ folder.
 3. main(void) to get rid of a novice-confusing warning.

projects/scripts/core_basic_window.c

@@ -4,24 +4,23 @@
 *
 *   Welcome to raylib!
 *
-*   To test examples, just press F6 and execute raylib_compile_execute script
-*   Note that compiled executable is placed in the same folder as .c file
-*
 *   You can find all basic examples on C:\raylib\raylib\examples folder or
 *   raylib official webpage: www.raylib.com
 *
 *   Enjoy using raylib. :)
 *
 *   This example has been created using raylib 1.0 (www.raylib.com)
+*   It has been re-confirmed with raylib 3.7.0
 *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
 *
 *   Copyright (c) 2013-2016 Ramon Santamaria (@raysan5)
+*   Simple adjustments on 2021-10-01
 *
 ********************************************************************************************/
 
-#include "raylib.h"
+#include <raylib.h>
 
-int main()
+int main(void)
 {
     // Initialization
     //--------------------------------------------------------------------------------------