GYP: Make the ARM simulator build with GYP again

build/armu.gypi

-# Copyright 2010 the V8 project authors. All rights reserved.
+# Copyright 2011 the V8 project authors. All rights reserved.
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 {
   'variables': {
+    'target_arch': 'ia32',
     'v8_target_arch': 'arm',
+    'armv7': 1,
+    'arm_neon': 0,
+    'arm_fpu': 'vfpv3',
   }
 }