core: examples: update import path style

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

src/core/examples/sysgpu/boids/main.zig

@@ -1,7 +1,9 @@
 /// A port of Austin Eng's "computeBoids" webgpu sample.
 /// https://github.com/austinEng/webgpu-samples/blob/main/src/sample/computeBoids/main.ts
 const std = @import("std");
-const core = @import("mach").core;
+
+const mach = @import("mach");
+const core = mach.core;
 const gpu = core.gpu;
 
 title_timer: core.Timer,