[PATCHv2] cifs-utils: work around missing krb5_free_string in Heimdal

[atheik]

On 3/4/22, Jeremy Allison <jra at samba.org> wrote:
> Does cifs-utils have a libreplace equivalent ?

I have no idea about libreplace but cifs.upcall.c of
cifs-utils already has a lot of these #ifdefs for
compatibility between MIT and Heimdal KRB5.

> Wouldn't it be easier to test for the existence of
> krb5_free_string() and write a libreplace wrapper
> function so krb5_free_string() can be called from
> all code without #ifdefs in the main code ?

This patch adds just another #ifdef to cifs.upcall.c
so that cifs-utils builds against Heimdal again.

I have attached a new patch that doesn't place the
#ifdefs in the function body.
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