Remove declaration of non-existing method

Change-Id: I7848260ead4bf16fb922a061cb61291a0fec8df8
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/qtattributionsscanner/scanner.h

@@ -37,7 +37,6 @@
 
 namespace Scanner {
 
-QVector<Package> readDirectory(const QString &packageDirectory, LogLevel logLevel);
 QVector<Package> scanDirectory(const QString &directory, LogLevel logLevel);
 
 }