[Bug c/104248] armel: C11 atomics requires to be linked with libatomic.a explicitly

[mathieu.malaterre at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104248

--- Comment #1 from Mathieu Malaterre <mathieu.malaterre at gmail dot com> ---
In case that help, cmake instructions for the test case is:

```
project(p C)
set(CMAKE_C_STANDARD 11)
add_library(foo STATIC foo.c)
add_executable(prog prog.c)
target_link_libraries(prog foo)
```