BUILD: threads: Add __ha_cas_dw fallback for single threaded builds

__ha_cas_dw() is used in fd_rm_from_fd_list() and when built without
USE_THREADS=1 the linker fails to find __ha_cas_dw(). Add a definition
of __ha_cas_dw() for the #ifndef USE_THREADS case.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
1 file changed