If it was one, build_oai without parameters would attempt to build the
ethernet library. However, this is unexpected, and will lead to an error
(as it is by default off in CMake). Set it to off, and build it where
required.

- move following radios: AW2S, BladeRF, IRIS, LMSSDR, RFsimulator, USRP
- move following transports: Ethernet, benetel4g, benetel5g
- for each: create independent cmake variable to switch compilation
  on/off, in order: OAI_AW2S, OAI_BLADERF, OAI_IRIS, OAI_LMSSDR,
  OAI_SIMU, OAI_USRP, OAI_ETHERNET, OAI_BENETEL4G, OAI_BENETEL5G
- Remove RF_BOARD variable, allows to compile multiple boards at once
- where applicable: remove USERSPACE/LIB in path, i.e., move files up to
  directories, as all are userspace libraries

Note that with the above, it is now mandatory to enable a radio
implementation before compiling it, e.g., for USRP:

./build_oai -w USRP
cmake .. -DOAI_USRP=ON && ninja oai_usrpdevif

- libcrypto is not used
- we use libcrypt, so correctly check for it, and link to the
  corresponding targets

Use target_include_directories() only on relevant targets.
Remove from some targets that don't use the config module.

- needs forms library, so link it
- fix warnings

Including sources in targets makes that file being compiled multiple
times. Instead, define an OBJECT library (i.e., it is only compiled, but
not linked), and link it into each target that uses it.

It uses definitions from stdlib.h, so include it.

Instead of using the adhoc code for checking and including (globally!)
BLAS/LAPACKE, use PkgConfig to correctly identify libs (see deleted
comment: "Hope this gets fixed in future!" -- you are welcome). Next,
only link into those libraries that need it (PHY_UE, SIMU). Note that
only RHEL also needs cblas, so it is a non-REQUIREd dependency that is
only linked in if available. Further, take out linking into all other
modules, as they don't need it.

In the source code, take out preprocessor directives to correctly
include headers -- that is cmake's job, which it does just fine now.

First, we do not include openssl globally using `include_directories()`,
as most modules don't need it. Further, it is linked into SECURITY, and
removed from all other targets (they don't need it, only SECURITY).

Finally, remove a header include in NR PDCP that is not needed

- LINUX: option to optionally set a sighandler for certain simulators,
  no practical relevance
- LINUX_LIST: not used anywhere
- DEBUG_DLSCH: referenced in the code, but those files have a separate
  (commented) line `#define DEBUG_DLSCH`; probably never used
- LINK_ENB_PDCP_TO_IP_DRIVER, LINK_ENB_PDCP_TO_GTPV1U: commented in
  cmake, although they are referenced. It is likely that code behaves
  unexpected if re-enabled; we therefore remove these options to avoid
  future problems
- Remove some more commented code

ENB_MODE is a cmake option to swap the order of include directories.
This has historical reasons; before OAI used cmake, it was very
sensitive to the order of includes. Nowadays, the order does not matter.
Remove this option, and fix the compilation issues that arise while
doing so.

This option is almost not referenced anywhere,  and not documented.
Remove it to avoid problems in the future.

- openair2/ENB_APP/CONTROL_MODULES: this directory does not exist
  anymore
- openair2/UTIL/{OMG,CLI,OMV}: not used anywhere

integration_2023_w24

See merge request oai/openairinterface5g!2171

* !2108 Fix reconfigurationWithSync
* !2138 check if SSB is on the sync raster for SA
* !2149 Fix for physCellId different from 0 for CU DU
* !2157 e1: fix security
* !2161 asn1: properly initialize variables for uper_decode() and aper_decode()
* !2143 PUCCH UE F0 and F1 refactoring and fixes
* !2170 bladerf: have it functional (lte only, no nr)
* !2102 Adding Sidelink (SL) carrier frequency
* !2096 remove generic thread pool abort and use 3GPP CRC to detect the segment is decoded
* !2158 NR UE adding flag for activation of AS security

1. Adding a "SL" frequency for Sidelink mode. The
   importance of this variable is to ensure that
   when we are in mode 1 (UE+UE+gNB), that the slot
   configuration and frequencies do not overlap. This
   SL frequency is important for rotation and allows
   us to utilize the OFDM modulation and demodulation
   functions that already exist in OAI.
2. Adding sl_mode to the command line for proper UE
   deployment when in SL mode. sl_mode can be set to 0,
   1, or 2. sl_mode 0 indicates no-Sidelink at all,
   mode 1 is gNB, UE, and UE (3GPP defines mode numbers).
   sl_mode 2 indicated UE to UE communications with no
   gNB at all.
3. New functions for calculating the carrier frequency
   for SL mode.

At Eurecom now we only have Nuand bladeRF 2.0 (bladerf2) and those
calibration calls fail, so let's remove them. Maybe they are needed
for other boards, but we can't test at Eurecom. In case of problems
with other boards, contact us.

clang annoying chosen options