Embedded Linux: stop mentioning Eclipse support in Buildroot and Yocto

- Yocto Eclipse plugin removed in 2.7
- Buildroot support not updated for years

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>

slides/sysdev-application-development/sysdev-application-development.tex

@@ -204,8 +204,6 @@ \subsection{Developing applications on embedded Linux}
   \item The platform is used by major embedded Linux software vendors
     for their (proprietary) system development kits: MontaVista
     DevRocket, TimeSys TimeStorm, Wind River Workbench, Sysgo ELinOS.
-  \item Used by free software build systems and development environments
-    too, such as Yocto Project and Buildroot.
   \item Eclipse now supports the Theia project
     (\url{https://theia-ide.org/}) that supports VS Code extensions,
     but with its own architecture. It's now used in many IDEs: