drivers: ethernet: remove dedicated drivers__ethernet__native_posix lib

Fixes: zephyrproject-rtos#38403

The two eth_native_posix.c and eth_native_posix_adapt.c are now added
to the common drivers__ethernet Zephyr library.

Instead of creating a dedicated library for just two files those files
are now added to the common ethernet library, see also zephyrproject-rtos#8826.
Instead, the dedicated compile definitions required for those files are
specified using COMPILE_DEFINITIONS on the source files.

This also avoids the following warning as the ethernet library is no
longer empty.

> No SOURCES given to Zephyr library: drivers__ethernet
>
> Excluding target from build.

Signed-off-by: Torsten Rasmussen <[email protected]>

drivers/ethernet/CMakeLists.txt

@@ -26,16 +26,12 @@ zephyr_library_sources_ifdef(CONFIG_ETH_SAM_GMAC eth_sam_gmac.c)
 zephyr_library_sources_ifdef(CONFIG_DSA_KSZ8XXX dsa_ksz8xxx.c)
 
 if(CONFIG_ETH_NATIVE_POSIX)
- zephyr_library_named(drivers__ethernet__native_posix)
- zephyr_library_compile_definitions(
- NO_POSIX_CHEATS
- _BSD_SOURCE
- _DEFAULT_SOURCE
- )
- zephyr_library_sources(
- eth_native_posix.c
- eth_native_posix_adapt.c
- )
+ set(native_posix_source_files eth_native_posix.c eth_native_posix_adapt.c)
+ set_source_files_properties(${native_posix_source_files}
+ PROPERTIES COMPILE_DEFINITIONS
+ "NO_POSIX_CHEATS;_BSD_SOURCE;_DEFAULT_SOURCE"
+ )
+ zephyr_library_sources(${native_posix_source_files})
 endif()
 
 add_subdirectory(phy)