* fix library exports for iconv on macOS, add Threads dependency for cairo, add the iconv, intl and Threads dependencies to harfbuzz
* updated portfile from harfbuzz fix
* fix indenting and order
* fix portfile
* [gettext] Add unofficial-gettext targets
* [gettext] Fixup for Linux
* fix pixman error message about Unknown thread local support
* fixes for building cairo on macOS
* corrected appending files to sources
* [cairo][pixman] Bump package versions to include source code changes