Removes unnecessary @available annotations

AltStore/Operations/EnableJITOperation.swift

@@ -11,7 +11,6 @@ import Combine
 
 import AltStoreCore
 
-@available(iOS 14, *)
 protocol EnableJITContext
 {
     var server: Server? { get }
@@ -20,7 +19,6 @@ protocol EnableJITContext
     var error: Error? { get }
 }
 
-@available(iOS 14, *)
 class EnableJITOperation<Context: EnableJITContext>: ResultOperation<Void>
 {
     let context: Context

AltStore/Operations/Patch App/PatchAppOperation.swift

@@ -15,7 +15,6 @@ import AltStoreCore
 import AltSign
 import Roxas
 
-@available(iOS 14, *)
 protocol PatchAppContext
 {
     var bundleIdentifier: String { get }
@@ -71,7 +70,6 @@ private struct OTAUpdate
     var archivePath: String
 }
 
-@available(iOS 14, *)
 class PatchAppOperation: ResultOperation<Void>
 {
     let context: PatchAppContext
@@ -148,7 +146,6 @@ private let ALTFragmentZipCallback: @convention(c) (UInt32) -> Void = { (percent
     progress.completedUnitCount = Int64(percentageComplete)
 }
 
-@available(iOS 14, *)
 private extension PatchAppOperation
 {
     func fetchOTAUpdate() -> AnyPublisher<OTAUpdate, Error>

AltStore/Operations/Patch App/PatchViewController.swift

@@ -13,7 +13,6 @@ import AltStoreCore
 import AltSign
 import Roxas
 
-@available(iOS 14.0, *)
 extension PatchViewController
 {
     enum Step
@@ -28,7 +27,6 @@ extension PatchViewController
     }
 }
 
-@available(iOS 14.0, *)
 class PatchViewController: UIViewController
 {
     var patchApp: AnyApp?
@@ -99,7 +97,6 @@ class PatchViewController: UIViewController
     }
 }
 
-@available(iOS 14.0, *)
 private extension PatchViewController
 {
     func update()
@@ -212,7 +209,6 @@ private extension PatchViewController
     }
 }
 
-@available(iOS 14.0, *)
 private extension PatchViewController
 {
     @IBAction func performButtonAction()
@@ -254,7 +250,6 @@ private extension PatchViewController
     }
 }
 
-@available(iOS 14.0, *)
 private extension PatchViewController
 {
     func startProcess()