libgo patch committed: If no MAP_ANON, use /dev/zero

[Ian Lance Taylor]

This patch adjusts libgo so that if the system does not support
MAP_ANON/MAP_ANONYMOUS, it mmaps from /dev/zero.  Bootstrapped and ran
Go testsuite (both using /dev/zero and not) on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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