autotools: remove macOS Frameworks support
This treats macOS/OSX like any other Unix-like build target (Darwin),
thus removing autotools support for macOS-specific build options.
Anyone needing that is advised to use the fully-supported-on-macOS CMake
build.
Change-Id: I88e2fa7a8eea42241efcf84223ac2362d38b1e12
Reviewed-on: https://code.wireshark.org/review/23951
Petri-Dish: João Valverde <j@v6e.pt>
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: João Valverde <j@v6e.pt>