Add integration test for building a local package with setup dependencies.

cabal-testsuite/PackageTests/NewBuild/CustomSetup/LocalPackageWithCustomSetup/Setup.hs

+import SetupDep (message)
+import Distribution.Simple
+
+main = putStrLn ("pkg Setup.hs: " ++ message) >> defaultMain

cabal-testsuite/PackageTests/NewBuild/CustomSetup/LocalPackageWithCustomSetup/build-local-package-with-custom-setup.out

+# cabal update
+Downloading the latest package list from test-local-repo
+# cabal new-build
+Resolving dependencies...
+In order, the following will be built:
+ - setup-dep-2.0 (lib:setup-dep) (requires download & build)
+ - pkg-1.0 (lib:pkg) (first run)
+Configuring setup-dep-2.0...
+Preprocessing library for setup-dep-2.0..
+Building library for setup-dep-2.0..
+Installing library in <PATH>

cabal-testsuite/PackageTests/NewBuild/CustomSetup/LocalPackageWithCustomSetup/build-local-package-with-custom-setup.test.hs

+import Test.Cabal.Prelude
+
+-- The one local package, pkg, has a setup dependency on setup-dep-2.0, which is
+-- in the repository.
+main = cabalTest $ do
+  skipUnless =<< hasNewBuildCompatBootCabal
+  withRepo "repo" $ do
+    r <- cabal' "new-build" ["pkg"]
+    -- pkg's setup script should print out a message that it imported from
+    -- setup-dep:
+    assertOutputContains "pkg Setup.hs: setup-dep-2.0" r

cabal-testsuite/PackageTests/NewBuild/CustomSetup/LocalPackageWithCustomSetup/cabal.project

+packages: *.cabal

cabal-testsuite/PackageTests/NewBuild/CustomSetup/LocalPackageWithCustomSetup/pkg.cabal

+name: pkg
+version: 1.0
+build-type: Custom
+cabal-version: >= 1.2
+
+custom-setup
+  setup-depends: base, Cabal, setup-dep
+
+library

cabal-testsuite/PackageTests/NewBuild/CustomSetup/LocalPackageWithCustomSetup/repo/setup-dep-2.0/SetupDep.hs

+module SetupDep (message) where
+
+message = "setup-dep-2.0"

cabal-testsuite/PackageTests/NewBuild/CustomSetup/LocalPackageWithCustomSetup/repo/setup-dep-2.0/setup-dep.cabal

+name: setup-dep
+version: 2.0
+build-type: Simple
+cabal-version: >= 1.2
+
+library
+  build-depends: base
+  exposed-modules: SetupDep