[PATCH] Fix compile on NetBSD-current for popcount

[Roy Marples]

Hi

NetBSD now ships popcount in libc, which does the same job as the gcc 
builtin that rxvt likes to use. This causes a header conflict as rxvt 
likes to alias this builtin to popcount.

Attached is a patch that checks for popcount in libc and uses that by 
preference.

Thanks!

Roy
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