mpv: remove unreferenced patch

Fixes: f2280510e3

pkgs/applications/video/mpv/0001-fix-darwin-build.patch

@@ -1,19 +0,0 @@
-diff --git a/osdep/mac/input_helper.swift b/osdep/mac/input_helper.swift
-index 0acec6bd40..0ec5837864 100644
---- a/osdep/mac/input_helper.swift
-+++ b/osdep/mac/input_helper.swift
-@@ -18,6 +18,14 @@
- import Cocoa
- import Carbon.HIToolbox
- 
-+extension NSCondition {
-+    fileprivate func withLock<T>(_ body: () throws -> T) rethrows -> T {
-+        self.lock()
-+        defer { self.unlock() }
-+        return try body()
-+    }
-+}
-+
- class InputHelper: NSObject {
-     var option: OptionHelper?
-     var lock = NSCondition()