ScreenRecorder: Remove dead end

Detected by Axivion plugin.

Change-Id: I0ebab7a2a64c860b01122f373719dcdaaf81f96a
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/screenrecorder/ffmpegutils.cpp

@@ -149,23 +149,6 @@ static QVersionNumber parseVersionNumber(const QByteArray &toolOutput)
     return result;
 }
 
-QVersionNumber toolVersion()
-{
-    Process proc;
-    const CommandLine cl{
-        Internal::settings().ffprobeTool(),
-        {
-            "-v", "quiet",
-            "-print_format", "json",
-            "-show_versions",
-        }
-    };
-    proc.setCommand(cl);
-    proc.runBlocking();
-    const QByteArray output = proc.allRawOutput();
-    return parseVersionNumber(output);
-}
-
 static ClipInfo parseClipInfo(const QByteArray &toolOutput)
 {
     ClipInfo result;

src/plugins/screenrecorder/ffmpegutils.h

@@ -82,7 +82,6 @@ private:
 
 namespace FFmpegUtils {
 
-QVersionNumber toolVersion();
 ClipInfo clipInfo(const Utils::FilePath &path);
 int parseFrameProgressFromOutput(const QByteArray &output);
 void sendQuitCommand(Utils::Process *proc);