[build.zig] Fix Zig emscripten build (#4012)

* Fix for issue #4010

Split the code for Zig's master branch and >= 0.12.0 due to changes in https://github.com/ziglang/zig/pull/19623

* Restore the cache_include path which was removed in error

Accidently removed a couple lines I didn't mean to 🙈

src/build.zig

@@ -201,10 +201,15 @@ fn compileRaylib(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.
             const cache_include = std.fs.path.join(b.allocator, &.{ b.sysroot.?, "cache", "sysroot", "include" }) catch @panic("Out of memory");
             defer b.allocator.free(cache_include);
 
-            var dir = std.fs.openDirAbsolute(cache_include, std.fs.Dir.OpenDirOptions{ .access_sub_paths = true, .no_follow = true }) catch @panic("No emscripten cache. Generate it!");
-            dir.close();
-
-            raylib.addIncludePath(b.path(cache_include));
+            if (comptime builtin.zig_version.minor > 12) {
+                var dir = std.fs.cwd().openDir(cache_include, std.fs.Dir.OpenDirOptions{ .access_sub_paths = true, .no_follow = true }) catch @panic("No emscripten cache. Generate it!");
+                dir.close();
+                raylib.addIncludePath(b.path(cache_include));
+            } else {
+                var dir = std.fs.openDirAbsolute(cache_include, std.fs.Dir.OpenDirOptions{ .access_sub_paths = true, .no_follow = true }) catch @panic("No emscripten cache. Generate it!");
+                dir.close();
+                raylib.addIncludePath(.{ .path = cache_include });
+            }
         },
         else => {
             @panic("Unsupported OS");