Revert 'Add missing dependency (#1414)'

The llbuild executable is not a dependency of this library.

Author: finagolfin

Package.swift

@@ -145,7 +145,6 @@ if ProcessInfo.processInfo.environment["SWIFT_DRIVER_LLBUILD_FWK"] == nil {
         ]
         package.targets.first(where: { $0.name == "SwiftDriverExecution" })!.dependencies += [
             .product(name: "llbuildSwift", package: "swift-llbuild"),
-            .product(name: "llbuild", package: "swift-llbuild"),
         ]
     } else {
         // In Swift CI, use a local path to llbuild to interoperate with tools
@@ -155,7 +154,6 @@ if ProcessInfo.processInfo.environment["SWIFT_DRIVER_LLBUILD_FWK"] == nil {
         ]
         package.targets.first(where: { $0.name == "SwiftDriverExecution" })!.dependencies += [
             .product(name: "llbuildSwift", package: "llbuild"),
-            .product(name: "llbuild", package: "llbuild"),
         ]
     }
 }