CMake does not check if wxPython dev files are present

[Antonio Vázquez Blanco]

CMake currently checks if wxPython is installed but does not check wether the corresponding development include files and libs are present in the system. For this reason, in a clean ubuntu 18.04 installation, if the following packages are installed:

```
cmake build-essential g++ libwxgtk3.0-gtk3-dev libglew-dev libglm-dev libcurl4 libcurl4-gnutls-dev libcairo2-dev libboost-dev libboost-test-dev git autoconf libtool automake flex bison liboce-foundation-dev liboce-ocaf-dev swig python python-dev ca-certificates python-wxgtk3.0 doxygen graphviz libssl-dev
```

we are able to execute CMake and start a compilation that will fail with the following error:

```
In file included from /builds/kicad-mirror/kicad-source-mirror/pcbnew/pcbnew.cpp:32:0:
/builds/kicad-mirror/kicad-source-mirror/pcbnew/swig/python_scripting.h:39:14: fatal error: wx/wxPython/wxPython.h: No such file or directory
     #include <wx/wxPython/wxPython.h>
```

Instead, if we install python-wxgtk3.0-dev on top of the previous packages everything will work.

Should CMake scripts check wether the corresponding files are present?

[KiCad Janitor (kicad-janitor)]

Fixed in revision 9519de8ab258d142952026f3bbebd1997e85ef16
https://git.launchpad.net/kicad/patch/?id=9519de8ab258d142952026f3bbebd1997e85ef16

[Antonio Vázquez Blanco (antoniovazquezblanco)]

Thank you very much!