Repo copy libpthreads to libkse.

This introduces the WITHOUT_LIBKSE nob,
and changes WITHOUT_LIBPTHREADS to mean with neither threading libs.
Approved by:	re(kensmith)

Makefile

@@ -6,7 +6,7 @@ SUBDIR=	${_ggatec} \
 	${_ggated} \
 	ggatel
 
-.if ${MK_LIBTHR} != "no" || ${MK_LIBPTHREAD} != "no"
+.if ${MK_LIBPTHREAD} != "no" && (${MK_LIBTHR} != "no" || ${MK_LIBKSE} != "no")
 _ggatec=	ggatec
 _ggated=	ggated
 .endif