autotools: Explicitly pass --tag=CC to libtool
Fixes a build error with the latest macOS:
libtool: compile: unable to infer tagged configuration
libtool: error: specify a tag with '--tag'Edited by Nirbheek Chauhan
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Fixes a build error with the latest macOS:
libtool: compile: unable to infer tagged configuration
libtool: error: specify a tag with '--tag'