Fix build with newer libssh and cmake

[Tomaz Canabrava]

Sorry, it unbreak things for me and breaks for others. I'll redo this

On Sun, Jun 28, 2015, 14:04 Dirk Hohndel <dirk at hohndel.org> wrote:

> On Sun, Jun 28, 2015 at 10:00:51AM -0700, Dirk Hohndel wrote:
> > On Sun, Jun 28, 2015 at 01:59:29PM -0300, Tomaz Canabrava wrote:
> > > libssh just changed the way it deals with CMakeFiles and I tougth poor
> dirk
> > > had broken the build, tsc.
> >
> > Does this break builds with older libssh?
>
> Well, of course it does:
>
> make
> -- out of source build from source in /home/hohndel/subsurface
> -- Configuring done
> CMake Warning (dev) at CMakeLists.txt:480 (add_executable):
> Policy CMP0028 is not set: Double colon in target name means ALIAS or
> IMPORTED target.  Run "cmake --help-policy CMP0028" for policy details.
> Use the cmake_policy command to set the policy and suppress this warning.
>
> Target "TestGpsCoords" links to target "Libssh2::libssh2" but the target
> was not found.  Perhaps a find_package() call is missing for an IMPORTED
> target, or an ALIAS target is missing?
> Call Stack (most recent call first): CMakeLists.txt:493 (TEST)
> This warning is for project developers.  Use -Wno-dev to suppress it.
>
> and then later
>
> Linking CXX executable subsurface
> /usr/bin/ld: cannot find -lLibssh2::libssh2
> collect2: error: ld returned 1 exit status
> CMakeFiles/subsurface.dir/build.make:288: recipe for target 'subsurface'
> failed
>
> So maybe this needs a little more work, Tomaz?
>
> /D
>
>
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