sysutils/htop: Update to 2.0.0

• Update to 2.0.0 with native FreeBSD support
  • Remove sysutils/lsof dependency
  • Remove linprocfs dependency
  • Delete redundant pkg-message
• Remove redundant GH_PROJECT
• Refactor post-patch to use shebangfix

Reviewed by: feld (mentor), koobs (mentor)
Approved by: feld (mentor)
Differential Revision: D5253