regex warnings on linux

[Sam Steingold]

fc4:

In file included from regex.c:86:
regcomp.c: In function 'regerror':
regcomp.c:563: warning: implicit declaration of function 'mempcpy'
regcomp.c:563: warning: incompatible implicit declaration of built-in function '
mempcpy'
regcomp.c: In function 'build_charclass':
regcomp.c:3616: warning: implicit declaration of function 'isblank'

-- 
Sam Steingold (http://www.podval.org/~sds) running w2k
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