Fix building on (unsupported) CentOS 7 #2496
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Signed-off-by: Quentin Armitage <quentin@armitage.org.uk>
Open file descriptor locks were introduced in Linux 3.15, so we cannot use that type of locking on systems with older kernels (e.g. CentOS 7, which of course is no longer supported). Since this problem only occurs on kernels no longer supported by keepalived this commit simply removes the file locking, rather than implementing a more comprehensive solution. It is expected that at some point, in order to simplify the code, support for kernels no longer supported by any of the main distros will be removed from keepalived. Signed-off-by: Quentin Armitage <quentin@armitage.org.uk>
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