Only collect buildDepends from enabled components when configuring

Might need to change a few other `buildDepends` too?

Author: Ericson2314

Cabal/Distribution/Simple/Configure.hs

@@ -512,6 +512,7 @@ configure (pkg_descr0', pbi) cfg = do
                 installedPackageSet
                 requiredDepsMap
                 pkg_descr
+                enabled
 
     -- Compute installation directory templates, based on user
     -- configuration.
@@ -975,9 +976,10 @@ configureDependencies
     -> InstalledPackageIndex -- ^ installed packages
     -> Map (PackageName, ComponentName) InstalledPackageInfo -- ^ required deps
     -> PackageDescription
+    -> ComponentRequestedSpec
     -> IO [(PackageName, ComponentName, InstalledPackageInfo)]
 configureDependencies verbosity use_external_internal_deps
-  installedPackageSet requiredDepsMap pkg_descr = do
+  installedPackageSet requiredDepsMap pkg_descr enableSpec = do
     let selectDependencies :: [LibDependency] ->
                               ([FailedDependency], [ResolvedDependency])
         selectDependencies =
@@ -986,7 +988,8 @@ configureDependencies verbosity use_external_internal_deps
                                   installedPackageSet
                                   requiredDepsMap use_external_internal_deps)
 
-        (failedDeps, allPkgDeps) = selectDependencies (buildDepends pkg_descr)
+        (failedDeps, allPkgDeps) =
+          selectDependencies (buildDependencies =<< enabledBuildInfos pkg_descr enableSpec)
 
         internalPkgDeps =
           [ dep | InternalDependency dep _ <- allPkgDeps ]