macosx: add own configure switch to disable the sparkle update framework
--enable-update-check enables update support in core, which is not needed for the mac platform. To avoid linking libgcrypt into the core, instead a new configure switch is introduced to disable sparkle support directly. Now, for disabling sparkle support, one needs to pass --disable-sparkle. It completely removed sparkle from the GUI, and does not copy the framework to the final bundle as well.
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