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As part of fixing issue OS#3075, we want to migrate support
for encoding system information from osmo-bsc to libosmocore.
This change ports osmo-bsc code for encoding SI rest octets.
The conversion was a bit tricky in some places because some
functions receive a 'struct gsm_bts' parameter in osmo-bsc.
In this libosmocore version, such functions expect parameters
which correspond to the individual fields of 'struct gsm_bts'
which are used by these functions.
Several structs from osmo-bsc's system_information.h are now
also declared in libosmocore headers, with an added osmo_ prefix
to avoid collisions with existing definitions in osmo-bsc.
Some helpers were ported from osmo-bsc's system_information.c
to libosmocore's gsm48_rest_octets.c. Contrary to osmo-bsc's
implementation they are now only visible within this file.
Unfortunately, this code ported from osmo-bsc lacks unit tests.
Change-Id: I47888965ab11bba1186c21987f1365c9270abeab
Related: OS#3075
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