Change our module code to not use the special symbol name init_module()

Change our module code to not use the special symbol name init_module()

Current glibc libraries include a function called init_module(). If we
use the same name, then a dlsym() can find the glibc function if the
module doesn't have an initialisation function.

In ldb, none of our modules have an init_module(), so we end up calling the libc
functions with bogus arguments.
(This used to be commit 1b0621068998590e7b1e9528b78744dcd2cd5909)