Merge remote-tracking branch 'origin/cleanup-cmake' into integration_2026_w07 (!3915)

Cleanup Cmake: remove some double compilation

Harmonize some cmake code to avoid double compilation, notably around
polar and smallblock. In develop, we just add their sources to other
targets, whereas now we define STATIC libraries (further changed to
shared library in !3856) to avoid double compilation.

With this command line:

    cmake .. -GNinja -DENABLE_TESTS=ON && ninja

shows that before we compile 12631 files, where after it is 12583

there is additional supporting cleanup (move code, remove headers,
types, ...).

there is more harmonization to do, I limited myself to some easy wins.
For instance, we do the same with PDCP/SDAP, and this should be
refactored into STATIC libraries as well.

openair2/COMMON/rrc_messages_types.h

@@ -414,22 +414,6 @@ typedef struct NbIoTRrcConfigurationReq_s {
   long                    ue_TimersAndConstants_n311_NB;
 } NbIoTRrcConfigurationReq;
 
-// gNB: GNB_APP -> RRC messages
-typedef struct NRRrcConfigurationReq_s {
-  uint32_t                tac;
-  plmn_id_t plmn[PLMN_LIST_MAX_SIZE];
-  uint8_t                 num_plmn;
-
-  bool um_on_default_drb;
-  bool                    enable_sdap;
-} gNB_RrcConfigurationReq;
-
-typedef struct NRDuDlReq_s {
-  rnti_t rnti;
-  uint8_t *buf;
-  uint64_t srb_id;
-}  NRDuDlReq_t;
-
 // eNB: realtime -> RRC messages
 typedef struct rrc_subframe_process_s {
   protocol_ctxt_t ctxt;