package/lvm2: bump version to 2.03.12

Downstream patches have been mainlined in commits [1] (v2.03.06) and
[2] (v2.03.12). Second patch was slightly modified, so replace
--disable-symvers with --with-symvers=no.

[1] https://github.com/lvmteam/lvm2/commit/125f27ac37bc9b93cc96f64052b9681b3d479ee1
[2] https://github.com/lvmteam/lvm2/commit/1cedbaf13778de02e38b5dc80a7af246b7ec83e5



Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>