[android][test] 'swift_interpreter' not available

The 'swift_interpreter' feature is added when targeting Linux,
however this feature is not available when targeting Android
specifically.

This marks the following failing tests as unsupported:

- Serialization/operator.swift
- Interpreter/return_from_main.swift
- Interpreter/mandelbrot.swift
- Interpreter/fractal.swift
- DebugInfo/variables-interpreter.swift
- 1_stdlib/Reflection_jit.swift

The following tests no longer pass, and instead are unsupported:

- Interpreter/shebang-env.swift
- Interpreter/protocol_lookup_jit.swift
- Interpreter/process_arguments.swift
- Interpreter/import.swift
- Driver/subcommands.swift
- Driver/options-interpreter.swift

These tests were passing because they use incorrect substitutions.
Tests should use `%target-swift-frontend` to invoke
`swift -frontend` with the correct `-target` specified, but
these tests use the plain `%swift`--which means they're running
against the host machine, not the target.

Author: modocache

test/lit.cfg

@@ -750,6 +750,8 @@ elif run_os == 'linux-androideabi':
         "ld -L%s" %
         (os.path.join(test_resource_dir, config.target_sdk_name)))
     config.environment['ANDROID_NDK_HOME'] = os.getenv("ANDROID_NDK_HOME")
+    # The Swift interpreter is not available when targeting Android.
+    config.available_features.remove('swift_interpreter')
 
 else:
     lit_config.fatal("Don't know how to define target_run and "