ports-mgmt/pkg-devel: update to 2.6.99.2

Changes:

• fetch: switch back to libfetch, completely remove curl
• add: resolve shlibs and provides via symlink directory layout
• add: ignore dead symlinks for provides/requires
• add: skip osversion check when force is set
• install -A: do not mark upgraded/reinstalled packages as automatic
• DB: fix a race condition in db initialization
• 400.status-pkg: provide an option to select the source to check
• docs: all manpages now mention -r can be called multiple times
• docs: update usage for create, install and set commands