[Rpm-maint] [rpm-software-management/rpm] fix rpmbuild failure because of wrong symlink length on some filesystems (#1740)

[Demi Marie Obenour]

Also note that `PATH_MAX` is not a good value for sizing stack buffers: on some systems (ex: GNU/Hurd) it is an absurdly large value.  Paths should be allocated on the heap instead.

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