[gccgo] Don't assume that random and strsignal exist in libgo

[Ian Lance Taylor]

This patch from Vinu Rajashekhar fixes libgo to not assume that random
and strsignal are available.  He is working on porting gccgo to RTEMS.

Original patch is http://codereview.appspot.com/1339042/show.

Committed to gccgo branch.

Ian

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