RemoteLinux: Suppress "-j" option in MakeInstallStep

Depending on the build system, the job count option as used in the
MakeStep class might not be available.

Task-number: QTCREATORBUG-22689
Change-Id: I8c6cf31bbd270816a527ab465a2125d7dfc1f7de
Reviewed-by: André Hartmann <aha_1980@gmx.de>

src/plugins/projectexplorer/makestep.h

@@ -71,7 +71,7 @@ public:
     static QString msgNoMakeCommand();
     static Task makeCommandMissingTask();
 
-    bool isJobCountSupported() const;
+    virtual bool isJobCountSupported() const;
     int jobCount() const;
     void setJobCount(int count);
     bool jobCountOverridesMakeflags() const;

src/plugins/remotelinux/makeinstallstep.h

@@ -48,6 +48,7 @@ private:
     bool init() override;
     void finish(bool success) override;
     void stdError(const QString &line) override;
+    bool isJobCountSupported() const override { return false; }
 
     Utils::FilePath installRoot() const;
     bool cleanInstallRoot() const;