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The recently added overlay cache directory support added to libapparmor
makes use of reallocarray(3) to resize memory allocations; however,
reallocarray() was only included in glibc 2.26. This commit adds a
configure check for reallocarray() and if it's not available, provides
it as a wrapper around realloc(3).

PR: apparmor/apparmor!100Signed-off-by: Steve Beattie <steve.beattie@canonical.com>
Acked-by: John Johansen <john.johansen@canonical.com>