exa links with libiconv but doesn't declare a dependency on it

[ryandesign (Ryan Carsten Schmidt)]

$ port installed exa
The following ports are currently installed:
  exa @0.9.0_1 (active)

$ otool -L /opt/local/bin/exa
/opt/local/bin/exa:
	/opt/local/lib/libiconv.2.dylib (compatibility version 9.0.0, current version 9.1.0)
	/System/Library/Frameworks/Security.framework/Versions/A/Security (compatibility version 1.0.0, current version 58286.70.15)
	/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 1455.12.0)
	/opt/local/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.11)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.50.4)
	/usr/lib/libresolv.9.dylib (compatibility version 1.0.0, current version 1.0.0)

[harens <harensdeveloper@…>]

In 02369fddbd17602ac171f1b53e184a5808874fa3/macports-ports (master):

exa: update to 0.10.1, add git and doc variants

• Add harens as a co-maintainer
• Do not build docs on macOS 10.12 and older by default
• Declares libiconv as a dependency

See: #60477
Closes: #60604