Move the sig*set macros following the functions inside their feature
test macro conditional.
This fixes the build on bare-metal targets following
commit 5c78499ae2ae6ac28854b43a1ad73d917b40c62d.
Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>
Acked-by: Corinna Vinschen <vinschen@redhat.com>