sysgpu: remove everything related to dawn

src/core/platform/native_entrypoint.zig

@@ -1,36 +0,0 @@
-// Check that the user's app matches the required interface.
-comptime {
-    if (!@import("builtin").is_test) @import("mach").core.AppInterface(@import("app"));
-}
-
-// Forward "app" declarations into our namespace, such that @import("root").foo works as expected.
-pub usingnamespace @import("app");
-const App = @import("app").App;
-
-const std = @import("std");
-
-const mach = @import("mach");
-const core = mach.core;
-
-pub usingnamespace if (!@hasDecl(App, "SYSGPUInterface")) extern struct {
-    pub const SYSGPUInterface = mach.sysgpu.Impl;
-} else struct {};
-
-pub fn main() !void {
-    // Run from the directory where the executable is located so relative assets can be found.
-    var buffer: [1024]u8 = undefined;
-    const path = std.fs.selfExeDirPath(buffer[0..]) catch ".";
-    std.posix.chdir(path) catch {};
-
-    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
-    defer _ = gpa.deinit();
-    core.allocator = gpa.allocator();
-
-    // Initialize GPU implementation
-    try mach.sysgpu.Impl.init(core.allocator, .{});
-
-    var app: App = undefined;
-    try app.init();
-    defer app.deinit();
-    while (!try core.update(&app)) {}
-}