Remove useless cmdlinet::clear() call

In cmdlinet this clears vectors that are about to die anyway, and because
it is called in a destructor it cannot dispatch to a child class. By
removing this call we can disabuse any extending child of the false
expectation that their derived clear() method will in fact be called.

Author: smowton

src/util/cmdline.cpp

@@ -18,7 +18,6 @@ cmdlinet::cmdlinet()
 
 cmdlinet::~cmdlinet()
 {
-  clear();
 }
 
 void cmdlinet::clear()