Fix nacl_integration to run 32bit tests with 32bit userland and 64bit kernel.

build/detect_host_arch.py

Index: build/detect_host_arch.py
diff --git a/build/detect_host_arch.py b/build/detect_host_arch.py
index 638dd68840979d806ba08a4ef561f567be966cf8..19579ebbc1376ad48da09bc12cc7e9a8c1e6561a 100755
--- a/build/detect_host_arch.py
+++ b/build/detect_host_arch.py
@@ -10,13 +10,8 @@ import re
 import sys
 
 
-def main():
-  print DoMain([])
-  return 0
-
-def DoMain(_):
-  """Hook to be called from gyp without starting a separate python
-  interpreter."""
+def HostArch():
+  """Returns the host architecture with a predictable string."""
   host_arch = platform.machine()
 
   # Convert machine type to format recognized by gyp.
@@ -36,5 +31,10 @@ def DoMain(_):
 
   return host_arch
 
+def DoMain(_):
+  """Hook to be called from gyp without starting a separate python
+  interpreter."""
+  return HostArch()
+
 if __name__ == '__main__':
-  sys.exit(main())
+  print DoMain([])