Force newlib configure check for .init_array support
Force newlib configure check for .init_array support

The Mac builders lack the readelf tool and therefore the newlib
configure check for .init_array/.fini_array support fails.
(The real bug is that newlib's configure is using plain readelf
rather than the cross-tool readelf supplied by the cross-binutils.
Actually, the real bug is that we are building newlib on Mac.)

A simple command-line argument to configure can force the result
so we get uniform configure settings regardless of the build host.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=1096
TEST=none

R=eaeltsin@google.com
TBR=

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@5890 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client