A number of simplifications and improvements.
- Don't download the unusued signature
- Use the standard ICONV knob instead of LIBICONV
- Improve option descriptions and proper capitalization
- Handle the SUID chmod in the plist instead of the Makefile
- Simplify CFLAGS modification and skip the unnecessary -std=c89 addition
- Don't patch docs installation out, just let pkg DTRT
- Switch WWW to https
No PORTREVISION bump because most of these changes are NOOPs, except
the WWW change which isn't worth forcing a rebuild for.