Disable LTO in builds of CanvasKit to reduce binary size (flutter/engine#40733)

Disable LTO in builds of CanvasKit to reduce binary size

engine/src/flutter/third_party/canvaskit/BUILD.gn

@@ -15,6 +15,9 @@ wasm_toolchain("canvaskit") {
     skia_use_libjpeg_turbo_decode = true
     skia_use_libpng_decode = true
     skia_use_libwebp_decode = true
+
+    # Disable LTO.
+    enable_lto = false
   }
 }
 
@@ -40,6 +43,9 @@ wasm_toolchain("canvaskit_chromium") {
     skia_use_libjpeg_turbo_decode = true
     skia_use_libpng_decode = true
     skia_use_libwebp_decode = true
+
+    # Disable LTO.
+    enable_lto = false
   }
 }