README: add libc6-dev-i386 dependency
This dependency is required while compiling moonjit (it's luajit's fork). Moonjit is used, for example, by Knot Resolver. Otherwise, compilation fails with the following output:
/usr/include/gnu/stubs.h:7:11: fatal error: gnu/stubs-32.h: No such file or directory
7 | # include <gnu/stubs-32.h>
| ^~~~~~~~~~~~~~~~
compilation terminated.
Reported-by: Michal Vasilek michal.vasilek@nic.cz
Edited by Josef Schlehofer