Roll buildroot to use Fuchsia toolchain for iOS arm simulator (#36631)

diff --git a/BUILD.gn b/BUILD.gn
index c4e5d0f..76f2dc2 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -33,7 +33,7 @@
   if (is_linux || is_fuchsia) {
     inputs = [ "//flutter/common/exported_symbols.sym" ]
     ldflags = [ "-Wl,--dynamic-list=" + rebase_path(inputs[0], root_build_dir) ]
-  } else if (is_mac && !use_xcode) {
+  } else if (is_mac) {
     inputs = [ "//flutter/common/exported_symbols_mac.sym" ]
     ldflags = [
       "-Xlinker",
diff --git a/DEPS b/DEPS
index 5b84eda..c0699cf 100644
--- a/DEPS
+++ b/DEPS
@@ -109,7 +109,7 @@
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + '6c65790a359a1fd24da736f54fe97236d0f1e249',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + '2fd45de1f80de6b535163573463924b4be68def0',
 
    # Fuchsia compatibility
    #