[3.2 backport] pkg/fileutil: fix constant for linux locking #12553
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This is a backport of #12440 to release-3.3 branch, fixing the critical bug in pkg/fileutil. All credits to @moritzboth and @joakim-tjernlund. Original description follows.
The constant F_OFD_GETLK is 36, not 37, according to
/usr/include/bits/fcntl-linux.h
Credits go to @joakim-tjernlund who digged deep enough
to find this.