[PR PATCH] Use the samba-provided CHECK_CFG method in configuration tests

[github at samba.org]

There is a new pull request by ita1024 against master on the Samba Samba Github repository

https://github.com/ita1024/samba master
https://github.com/samba-team/samba/pull/8

Use the samba-provided CHECK_CFG method in configuration tests
This is for forward compatibility with waf 1.8. All other tests
use CHECK_CFG, but check_cfg was re-introduced for some reason.

A patch file from https://github.com/samba-team/samba/pull/8.patch is attached
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