codegen: Avoid symbol clashes with "va_*" from "stdarg.h"
codegen: Avoid symbol clashes with "va_*" from "stdarg.h"

Make a better choice for naming the local variables in
CCodeArrayModule.append_params_array()

In addition to 98ab3da89640b8b8a6c67044b4df1194672774bb

Fixes https://gitlab.gnome.org/GNOME/vala/issues/923

frida/vala,GNOME/vala,frida/vala,GNOME/vala,GNOME/vala,frida/vala,frida/vala,GNOME/vala,frida/vala