Revert of Non-SFI mode: Add Linux asynchronous signal support

tests/nonsfi/nacl.scons

Index: tests/nonsfi/nacl.scons
diff --git a/tests/nonsfi/nacl.scons b/tests/nonsfi/nacl.scons
index 8cb846364d6f1c4d5afbc415ead15a532857e3a0..52fe7f01f591b20c80f1c5d27ea8e1410e6e4ca5 100644
--- a/tests/nonsfi/nacl.scons
+++ b/tests/nonsfi/nacl.scons
@@ -20,15 +20,6 @@
              not env.Bit('tests_use_irt'))
 env.AddNodeToTestSuite(node, ['small_tests'], 'run_icache_test',
                        is_broken=is_broken)
-
-# Tests sending and receiving userspace signals. This test only works with the
-# newlib nonsfi loader.
-if env.Bit('tests_use_irt') and env.Bit('use_newlib_nonsfi_loader'):
-  nexe = env.ComponentProgram('user_async_signal_test',
-                              'user_async_signal_test.cc',
-                              EXTRA_LIBS=['${NONIRT_LIBS}'])
-  node = env.CommandSelLdrTestNacl('user_async_signal_test.out', nexe)
-  env.AddNodeToTestSuite(node, ['small_tests'], 'run_user_async_signal_test')
 
 # The subsequent tests are for syscall wrappers required by newlib
 # based non-SFI nacl_helper. The rest of NaCl does not need them.