Roll buildroot and set ios_use_simulator variable used by Skia GN scripts (#52101)

Author: jason-simmons

DEPS

@@ -288,7 +288,7 @@ allowed_hosts = [
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + 'dcd71b5b237e1e58f2ad8a7e51bead0c2a3755a9',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + '915f67999bfb4eb77cf596bbadacdce7868ede49',
 
   'src/flutter/third_party/depot_tools':
   Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '580b4ff3f5cd0dcaa2eacda28cefe0f45320e8f7',

tools/gn

@@ -576,11 +576,12 @@ def to_gn_args(args):
   if get_host_os() == 'mac' and not args.force_mac_arm64:
     gn_args['host_cpu'] = 'x64'
 
-  if gn_args['target_os'] == 'ios':
-    gn_args['use_ios_simulator'] = args.simulator
-    gn_args.update(setup_apple_sdks())
-  elif get_host_os() == 'mac':
-    gn_args['use_ios_simulator'] = False
+  if gn_args['target_os'] == 'ios' or get_host_os() == 'mac':
+    if gn_args['target_os'] == 'ios':
+      gn_args['use_ios_simulator'] = args.simulator
+    else:
+      gn_args['use_ios_simulator'] = False
+    gn_args['ios_use_simulator'] = gn_args['use_ios_simulator']
     gn_args.update(setup_apple_sdks())
 
   if args.dart_debug: