19634: tree-wide: mixed box of compilation fixes with clang r=benpicco a=maribu
### Contribution description
As the title says: This should increase the number of apps being able to build with clang quite a bit.
Co-authored-by: Marian Buschsieweke <marian.buschsieweke@ovgu.de>
Co-authored-by: Marian Buschsieweke <marian.buschsieweke@posteo.net>
As a leftovers from https://github.com/RIOT-OS/RIOT/pull/18355 are still
present that check for `MODULE_SHELL_COMMANDS` rather than
`MODULE_SHELL_CMDS`. This updates the conditionals as needed.
The package uses the nRFx SDK package `nrfx`. In addition, the `mynewt-nimble` repository contains some files (`porting/nimble/src/hal_timer.c` and `porting/npl/riot/src/nrf5x_isr.c`) that are compilable only for nRF MCUs. To allow the compilation for other platforms, the use of the `nrfx` package and the compilation of these files are now dependent on the use of any nRF5x MCU.
If the package is used for a controller that supports the HCI UART H4 transport layer protocol, the functions implemented in `nimble/transport/common/hci_h4` are very useful to deal with H4 formatted packages. If required, they can be enabled by module `nimble_transport_hci_h4`.
Using a `BLE_ADDR_RANDOM` as the peer address type allows connecting only to peers that have a static random address. Deriving the peer address type from the peer address is simple and allows connections to be established with peers that have either a public or
static random address.
If the Bluetooth 5 Advertising Extension is enabled by the `nimble_adv_ext` module, up to 3 events come in from the controller during connection establishment before they are processed by the host. The default size of the event queue `MYNEWT_VAL_BLE_TRANSPORT_EVT_COUNT` with only 2 entries is therefore too small and the connection establishment fails.
To control the compilation of NimBLE modules `nimble_*_ext` that require the Bluetooth 5 Advertising Extension, the `ble_adv_ext` is introduced to indicate that a platform supports this feature.
Implement a new module stdio_nimble, which uses nimble
for stdio. The characteristic for stdin is writable and
the characteristic for stdout uses the indicate mechanism
to publish the system's output to a connected device.
Data will be sent out asynchronously via callout functions.
The module can be enabled with "USEMODULE += stdio_nimble"
Co-authored-by: Francisco Molina <femolina@uc.cl>
Also brutally silence -Wcast-align warnings in OS_MBUF_PKTHDR()
and OS_MBUF_PKTHDR_TO_MBUF(), as those are used by nimble users.
It might make sense to check if the silenced / disabled warnings do
indeed point out unaligned memory accesses.
