Fix microphone access for macOS DMG (#945)

Author: jopohl

data/pyinstaller_helper.py

@@ -62,10 +62,10 @@ def run_pyinstaller(cmd_list: list, env: list=None):
             p = plistlib.load(f)
         p["NSHighResolutionCapable"] = True
         p["NSRequiresAquaSystemAppearance"] = True
+        p["NSMicrophoneUsageDescription"] = "URH needs access to your microphone to capture signals via Soundcard."
         with open("pyinstaller/urh.app/Contents/Info.plist", "wb") as f:
             plistlib.dump(p, f)
 
-
     else:
         for cmd in [urh_cmd, cli_cmd, urh_debug_cmd]:
             run_pyinstaller(cmd)