[PR PATCH] Improve amd64 detection on sunos

[github at samba.org]

There is a new pull request by amalleo25 against master on the Samba Samba Github repository

https://github.com/amalleo25/samba sunos-amd64-detection
https://github.com/samba-team/samba/pull/208

Improve amd64 detection on sunos
SunOS may not include x86_64 or amd64 in uname output. Instead, isainfo can be used to determine architecture. SunOS also does not support noexecstack option (to my knowledge) so we skip noexecstack linking check.

Signed-off-by: Adam Malleo <amalleo25 at gmail.com>

A patch file from https://github.com/samba-team/samba/pull/208.patch is attached
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