Minor tweak to wiki Linux build instructions.

[alarson]

On https://wiki.qemu.org/Hosts/Linux the list of recommended packages currently is a mix of RedHat and Debian names.  I suggest the following instead:

==== Recommended additional packages ====

Package names are for Debian(RedHat).

* git-email, used for sending patches
* libsdl2-dev(libsdl2-devel), needed for the SDL based graphical user interface
* libgtk-3-dev(gtk3-devel), for a simple UI instead of VNC
* libvte-dev(vte-devel), for access to QEMU monitor and serial/console devices via the GTK interface
* libcapstone-dev(libcapsone-devel), for disassembling CPU instructions