grsync: add formula

v1:  Passes brew audit
v2:  add gettext as an explicit dependency
Signed-off-by: Mark Histed <mhisted@gmail.com>
grsync: add 1.2.4 bottle.

Closes #31748.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
grsync: remove failing test.