Allow explicit disabling of optional options

[Aaron Walker <ka0ttic@…>]

I'm thinking of adding a minimal USE flag to the gentoo ebuild, for only installing the absolute minimum needed for a working server (embedded stuff can definitely benefit from this).

Since using pcre is optional, we should provide an AC_ARG_WITH for it for completely disabling the option, since as it is now if it's installed it will be used. Unlike the other AC_ARG_WITH's however, the attached patch has it default to "yes", for obvious reasons.

[jan]

added in [639]

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