build: Add explicit mention of --abi-check-disable to ABI checker

build: Add explicit mention of --abi-check-disable to ABI checker

This information has always been in the linked wiki page, but put it
in the build to unblock developers using platforms with slightly
different GDB output.

We can also assist this by improving the string normalisiation in the
ABI checker when example errors are provided.

It is better to build with the waf build and the full testsuite than
to avoid the waf build or not to use the developer options simply to
skip the ABI checker.

Andrew Bartlett

Autobuild-User: Andrew Bartlett <abartlet@samba.org>
Autobuild-Date: Wed May 16 01:53:42 CEST 2012 on sn-devel-104