Install the back-deployment concurrency libraries in most configurations.

Author: DougGregor

utils/build-presets.ini

@@ -37,6 +37,7 @@ build-swift-stdlib-unittest-extra
 
 install-llvm
 install-swift
+install-back-deploy-concurrency
 
 skip-test-cmark
 
@@ -1245,6 +1246,7 @@ install-swiftevolve
 install-playgroundsupport
 install-libcxx
 install-sourcekit-lsp
+install-back-deploy-concurrency
 
 install-destdir=%(install_destdir)s
 
@@ -2497,6 +2499,7 @@ ios
 tvos
 watchos
 back-deploy-concurrency
+install-back-deploy-concurrency
 compiler-vendor=apple
 darwin-install-extract-symbols
 darwin-toolchain-alias=swift