Fix debugging on Android arm64/x86_64

On Android 64, there is no lib/ symlink anymore, so we need to upload
gdbserver from QtCreator.

Change-Id: Ib6f6d9b623dc61b72dd434ce1b3b409e880bdeaa
Reviewed-by: Vikas Pachdha <vikas.pachdha@qt.io>

src/plugins/android/androidconfigurations.h

@@ -106,6 +106,7 @@ public:
     void setSdkManagerToolArgs(const QStringList &args);
 
     Utils::FileName ndkLocation() const;
+    Utils::FileName gdbServer(const ProjectExplorer::Abi &abi) const;
     QVersionNumber ndkVersion() const;
     void setNdkLocation(const Utils::FileName &ndkLocation);