Pass hostToolchainBinDir to SwiftSDKBundleStore (#2157)

This became a required parameter in
swiftlang/swift-package-manager#8668, which can
be easily computed, since the host toolchain in practice is always available when `SwiftSDKBundleStore` is initialized.

Author: MaxDesiatov

Sources/BuildSystemIntegration/SwiftPMBuildSystem.swift

@@ -221,6 +221,7 @@ package actor SwiftPMBuildSystem: BuiltInBuildSystem {
             try AbsolutePath(validating: $0, relativeTo: absProjectRoot)
           }
         ),
+        hostToolchainBinDir: hostSwiftPMToolchain.swiftCompilerPath.parentDirectory,
         fileSystem: localFileSystem,
         observabilityScope: observabilitySystem.topScope.makeChildScope(description: "SwiftPM Bundle Store"),
         outputHandler: { _ in }