Updated URLs in the ANNOUNCE.
Updated URLs in the ANNOUNCE.

gnustep/libobjc2,ngrewe/libobjc2,crystax/android-vendor-libobjc2,crystax/android-vendor-libobjc2,darlinghq/darling-libobjc2,gnustep/libobjc2,darlinghq/darling-libobjc2,ngrewe/libobjc2