(The other Samba is meant. The slow one, not the nice one.)

Creator manages to feed the CppModelManager with all kinds of
wrong include paths. That is usually not a big issue as long
as that path is not a simple "/".

CppManager appended a separator to all incoming include paths.
And when the above "/" was passed in, we had (on my machine)
7 seconds of Samba Network lookup, multiple times during a
parse. And the sad thing was that my dear colleagues in the
Intranet did not even have the searched-for header files on
their shared folders.

This patch makes sure that a separator is only appended if
the path does not already end with one.

The real core of the issue (wrong include paths from Creator)
still needs to be fixed.

Done-with: Roberto Raggi