Add //build/config/BUILD.gn to exec whitelist for GN.

Affected Linux GN build, not Windows.

R=kjellander@chromium.org
BUG=libyuv:583
TESTED=gn gen out/Debug --args=is_debug=true

Review URL: https://codereview.chromium.org/1866743002 .

.gn

@@ -24,6 +24,7 @@ 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.gn

@@ -20,6 +20,7 @@ use_neon = current_cpu == "arm64" || (current_cpu == "arm" && (arm_use_neon || a
 
 source_set("libyuv") {
   sources = [
+    # Headers
     "include/libyuv.h",
     "include/libyuv/basic_types.h",
     "include/libyuv/compare.h",
@@ -40,7 +41,7 @@ source_set("libyuv") {
     "include/libyuv/version.h",
     "include/libyuv/video_common.h",
 
-    # sources.
+    # Source Files
     "source/compare.cc",
     "source/compare_common.cc",
     "source/compare_gcc.cc",
@@ -113,6 +114,7 @@ source_set("libyuv") {
 if (use_neon) {
   static_library("libyuv_neon") {
     sources = [
+      # ARM Source Files
       "source/compare_neon.cc",
       "source/compare_neon64.cc",
       "source/rotate_neon.cc",

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1581
+Version: 1582
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1581
+#define LIBYUV_VERSION 1582
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT