Log Message:
wm/enlightenment: update to 1.0.21

pkgsrc-specific changes:
 - add options for pango, a choice of audio back-end, and font
   inclusion (which may not be necessary, depending on the target OS)
 - enable more modern X11 features
 - note correct license

Addresses PR pkg/52952 by Vicente Chaves.

(Quoting the upstream change log would be excessive here, as there's
been twelve years of development since this package was last updated in
pkgsrc. Those interested should simply look at the package's ChangeLog
file.)

(TBD: this package should probably be renamed to "enlightenment16", to
avoid confusion and conflict with x11/enlightenment. These two packages
should be able to co-exist, if desired. This version continues to be
relevant as it's more lightweight and has fewer dependencies.)