Due to the GCC Import (I think) QuakeForge 0.5.4 broke on architectures
without a __builtin_alloca. This patch unbreaks configure to detect alloca().
Compile and run-testet on 4-STABLE/i386, 5-CURRENT/i386 and 5-CURRENT/alpha.
Please commit this rather trivial fix before the ports freeze. Thank you.
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I'll take this.