Revert "Add support of cross-building the engine for ARM64 Linux Host (flutter#20254)"

This reverts commit 101d85a.

Author: dwrobel

AUTHORS

@@ -15,6 +15,4 @@ Simon Lightfoot <[email protected]>
 Dwayne Slater <[email protected]>
 Tetsuhiro Ueda <[email protected]>
 shoryukenn <[email protected]>
-SOTEC GmbH & Co. KG <[email protected]>
-Hidenori Matsubayashi <[email protected]>
 Sarbagya Dhaubanjar <[email protected]>

BUILD.gn

@@ -46,19 +46,14 @@ group("flutter") {
     "//flutter/sky",
   ]
 
-  # Flutter SDK artifacts should only be built when either doing host builds, or
-  # for cross-compiled desktop targets.
-  build_engine_artifacts =
-      current_toolchain == host_toolchain || (is_linux && !is_chromeos)
-
   # If enbaled, compile the SDK / snapshot.
   if (!is_fuchsia) {
     public_deps += [
       "//flutter/lib/snapshot:generate_snapshot_bin",
       "//flutter/lib/snapshot:kernel_platform_files",
     ]
 
-    if (build_engine_artifacts) {
+    if (current_toolchain == host_toolchain) {
       public_deps += [
         "//flutter/flutter_frontend_server:frontend_server",
         "//third_party/dart:create_sdk",
@@ -70,7 +65,8 @@ group("flutter") {
     }
   }
 
-  if (build_engine_artifacts) {
+  # If on the host, compile tools.
+  if (current_toolchain == host_toolchain) {
     public_deps += [
       "//flutter/shell/testing",
       "//flutter/tools/const_finder",

DEPS

@@ -626,23 +626,14 @@ hooks = [
     ],
   },
   {
-    'name': 'linux_sysroot_x64',
+    'name': 'linux_sysroot',
     'pattern': '.',
     'condition': 'download_linux_deps',
     'action': [
       'python',
       'src/build/linux/sysroot_scripts/install-sysroot.py',
       '--arch=x64'],
   },
-  {
-    'name': 'linux_sysroot_arm64',
-    'pattern': '.',
-    'condition': 'download_linux_deps',
-    'action': [
-      'python',
-      'src/build/linux/sysroot_scripts/install-sysroot.py',
-      '--arch=arm64'],
-  },
   {
     'name': 'dart package config',
     'pattern': '.',