Add GN files that need exec_script to list for win64 clang-cl

.gn

Index: .gn
diff --git a/.gn b/.gn
index 5f2d3b69ff852cac095dedbca2a8227055759dc6..a1eaeb3d402b3ac9bf2f858136ef8bb792eff563 100644
--- a/.gn
+++ b/.gn
@@ -24,11 +24,11 @@ check_targets = [ "//libyuv/*" ]
 # to force additional review for new uses of exec_script, which is strongly
 # discouraged except for gypi_to_gn calls.
 exec_script_whitelist = [
-  "//build/config/BUILD.gn",
   "//build/config/android/BUILD.gn",
   "//build/config/android/config.gni",
   "//build/config/android/internal_rules.gni",
   "//build/config/android/rules.gni",
+  "//build/config/BUILD.gn",
   "//build/config/compiler/BUILD.gn",
   "//build/config/gcc/gcc_version.gni",
   "//build/config/ios/ios_sdk.gni",
@@ -37,6 +37,7 @@ exec_script_whitelist = [
   "//build/config/mac/mac_sdk.gni",
   "//build/config/posix/BUILD.gn",
   "//build/config/sysroot.gni",
+  "//build/config/win/BUILD.gn",
   "//build/config/win/visual_studio_version.gni",
   "//build/gn_helpers.py",
   "//build/gypi_to_gn.py",
@@ -45,3 +46,4 @@ exec_script_whitelist = [
   "//build/toolchain/mac/BUILD.gn",
   "//build/toolchain/win/BUILD.gn",
 ]
+