build: Force determinism in official build

Helps build with ccache.

src/build/config/compiler/BUILD.gn

@@ -1420,7 +1420,7 @@ config("compiler_deterministic") {
 
   # Eliminate build metadata (__DATE__, __TIME__ and __TIMESTAMP__) for
   # deterministic build.  See https://crbug.com/314403
-  if (!is_official_build) {
+  if (true) {
     if (is_win && !is_clang) {
       cflags += [
         "/wd4117",  # Trying to define or undefine a predefined macro.