Bump to Zig 0.12/raylib 5.1-dev (#81)

* Update to Zig 0.12.0 and raylib 5.1-dev

* More build.zig fixes for 0.12

* Get module with target and optimization

* Add examples to build step when compiling for emscripten

* Remove unused function

* Add build.* and emcc.zig to the zon paths (#83)

As per some info found through https://github.com/ziglang/zig/issues/18282,
this is apparently necessary to use this library as a dependency.

Co-authored-by: Drum Ogilvie <me@daogilvie.com>

* Update binding

lib/preludes/rlgl-prelude.zig

@@ -14,10 +14,11 @@ pub const rlVertexBuffer = extern struct {
     elementCount: c_int,
     vertices: [*c]f32,
     texcoords: [*c]f32,
+    normals: [*c]f32,
     colors: [*c]u8,
     indices: [*c]c_ushort,
     vaoId: c_uint,
-    vboId: [4]c_uint,
+    vboId: [5]c_uint,
 };
 
 pub const rlDrawCall = extern struct {