• Don't override LDFLAGS in configure: this can result in USES+=ssl provided LDFLAGS not being honored.
• Enable/disable IPv6 support fully with the IPV6 option.
• Pass -I via CPPFLAGS: this unbreaks pcre inclusion in base.
• Pass --with(out?)-pcre, as requested by the PCRE option.
• Add missing LIB_DEPENDS for ports-mgmt/pkg and devel/pcre, depending on the appropriate option. Found by make stage-qa.
• Move USES up to silence complaint from portlint.

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