Allow plugins to support bitcode (#72151)

packages/flutter_tools/bin/podhelper.rb

@@ -59,7 +59,6 @@ def flutter_additional_ios_build_settings(target)
     build_configuration.build_settings['OTHER_LDFLAGS'] = '$(inherited) -framework Flutter'
 
     build_configuration.build_settings['CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER'] = 'NO'
-    build_configuration.build_settings['ENABLE_BITCODE'] = 'NO'
     # Suppress warning when pod supports a version lower than the minimum supported by Xcode (Xcode 12 - iOS 9).
     # This warning is harmless but confusing--it's not a bad thing for dependencies to support a lower version.
     # When deleted, the deployment version will inherit from the higher version derived from the 'Runner' target.

packages/flutter_tools/lib/src/commands/build_ios_framework.dart

@@ -449,7 +449,6 @@ end
         xcodeBuildConfiguration,
         'SYMROOT=${iPhoneBuildOutput.path}',
         'BITCODE_GENERATION_MODE=$bitcodeGenerationMode',
-        'ENABLE_BITCODE=YES', // Support host apps with bitcode enabled.
         'ONLY_ACTIVE_ARCH=NO', // No device targeted, so build all valid architectures.
         'BUILD_LIBRARY_FOR_DISTRIBUTION=YES',
       ];