sergey-safarov created an issue (kamailio/kamailio#4333)

### Description

I want to compile Kamailio sources on `ppc64le` arch. During compilation, I see an error

```sh [ 0%] Building C object src/CMakeFiles/kamailio.dir/main.c.o In file included from /tmp/kamailio/src/core/parser/../mem/../lock_ops.h:92, from /tmp/kamailio/src/core/parser/../mem/shm.h:44, from /tmp/kamailio/src/core/parser/../mem/shm_mem.h:32, from /tmp/kamailio/src/core/parser/../ut.h:46, from /tmp/kamailio/src/core/parser/../ip_addr.h:41, from /tmp/kamailio/src/core/parser/msg_parser.h:39, from /tmp/kamailio/src/core/select.h:36, from /tmp/kamailio/src/core/route_struct.h:35, from /tmp/kamailio/src/core/route.h:39, from /tmp/kamailio/src/main.c:79: /tmp/kamailio/src/core/parser/../mem/../fastlock.h:130:2: error: #error "unknown architecture" 130 | #error "unknown architecture" | ^~~~~ /tmp/kamailio/src/core/parser/../mem/../fastlock.h: In function ‘tsl’: /tmp/kamailio/src/core/parser/../mem/../fastlock.h:294:2: error: #error "unknown architecture" 294 | #error "unknown architecture" | ^~~~~ /tmp/kamailio/src/core/parser/../mem/../fastlock.h: In function ‘get_lock’: /tmp/kamailio/src/core/parser/../mem/../fastlock.h:317:9: error: implicit declaration of function ‘membar_getlock’ [-Wimplicit-function-declaration] 317 | membar_getlock(); | ^~~~~~~~~~~~~~ /tmp/kamailio/src/core/parser/../mem/../fastlock.h: In function ‘release_lock’: /tmp/kamailio/src/core/parser/../mem/../fastlock.h:436:2: error: #error "unknown architecture" 436 | #error "unknown architecture" | ^~~~~ In file included from /tmp/kamailio/src/core/atomic_ops.h:180, from /tmp/kamailio/src/core/locking.h:74, from /tmp/kamailio/src/core/rpc.h:36, from /tmp/kamailio/src/core/sr_module.h:38, from /tmp/kamailio/src/main.c:85: /tmp/kamailio/src/core/atomic/atomic_unknown.h: At top level: /tmp/kamailio/src/core/atomic/atomic_unknown.h:53:2: warning: #warning no native memory barrier implementations, falling back to slow lock based workaround [-Wcpp] 53 | #warning no native memory barrier implementations, falling back to slow lock \ | ^~~~~~~ gmake[2]: *** [src/CMakeFiles/kamailio.dir/build.make:76: src/CMakeFiles/kamailio.dir/main.c.o] Error 1 gmake[1]: *** [CMakeFiles/Makefile2:3359: src/CMakeFiles/kamailio.dir/all] Error 2 gmake: *** [Makefile:156: all] Error 2 ```

### Expected behavior Sources compiled without error messages.

#### Actual observed behavior Build failed be error described above.

### Reproduction ```sh git clone https://github.com/kamailio/kamailio.git docker run -it \ --platform linux/ppc64le \ -v ./kamailio:/usr/src/kamailio \ ghcr.io/sergey-safarov/kamailio-builder:centos-10 cd /usr/src/kamailio cmake -S . -B build cmake --build build ```