Stop building backdeploy concurrency in package bot

The backdeploy concurrency library is slated for removal.
Turning it off on the package OSX bot as it is currently failing to
build since it's not linking against compiler-rt.

Author: etcwilde

utils/build-presets.ini

@@ -1247,9 +1247,6 @@ indexstore-db
 sourcekit-lsp
 swiftdocc
 
-# Build concurrency back-deployment binaries
-back-deploy-concurrency
-
 # Don't generate the SwiftSyntax gyb files. Instead verify that up-to-date ones
 # are checked in.
 swiftsyntax-verify-generated-files
@@ -1291,7 +1288,6 @@ install-playgroundsupport
 install-libcxx
 install-sourcekit-lsp
 install-swiftformat
-install-back-deploy-concurrency
 install-swiftdocc
 
 install-destdir=%(install_destdir)s