[PR PATCH] fix implicit declaration of function ‘getpid’

[github at samba.org]

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

https://github.com/stuarthu/samba master
https://github.com/samba-team/samba/pull/167

fix implicit declaration of function ‘getpid’
error happens when configure --enable-developer

Signed-off-by: Stuart Hu <hushijie at qiniu.com>

A patch file from https://github.com/samba-team/samba/pull/167.patch is attached
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