Fix build on OpenBSD with BSD userland emu and smartcard NSS enabled

The first issue is the hard coded POSIX Real Time extensions library in the
libcacard/Makefile. From looking at the code it doesn't seem this is necessary
anyway. Robert Relyea seems to think it most likely isn't necessary.

The second issue was the missing exclusion of the BSD userland binary
builds from the addition of this Makefile target for the smartcard NSS
code which breaks the builds if smartcard NSS support is enabled.

pastebin clip of the build failure..

http://pastebin.com/raw.php?i=BLCKd3s6Signed-off-by: NBrad Smith <brad@comstyle.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

Makefile.target

@@ -387,9 +387,11 @@ obj-y += $(addprefix $(HWDIR)/, $(hw-obj-y))
 endif # CONFIG_SOFTMMU
 
 ifndef CONFIG_LINUX_USER
+ifndef CONFIG_BSD_USER
 # libcacard needs qemu-thread support, and besides is only needed by devices
-# so not requires with linux-user targets
+# so not requires with linux-user / bsd-user targets
 obj-$(CONFIG_SMARTCARD_NSS) += $(addprefix ../libcacard/, $(libcacard-y))
+endif # CONFIG_BSD_USER
 endif # CONFIG_LINUX_USER
 
 obj-y += $(addprefix ../, $(trace-obj-y))

libcacard/Makefile

@@ -20,7 +20,7 @@ QEMU_CFLAGS+=$(GLIB_CFLAGS)
 libcacard.lib-y=$(addsuffix .lo,$(basename $(libcacard-y)))
 
 vscclient: $(libcacard-y) $(QEMU_OBJS) vscclient.o
-	$(call quiet-command,$(CC) -o $@ $^ $(libcacard_libs) $(LIBS) -lrt,"  LINK  $@")
+	$(call quiet-command,$(CC) -o $@ $^ $(libcacard_libs) $(LIBS),"  LINK  $@")
 
 clean:
 	rm -f *.o */*.o *.d */*.d *.a */*.a *~ */*~ vscclient *.lo .libs/* *.la *.pc
@@ -39,7 +39,7 @@ install-libcacard:
 	@echo "libtool is missing, please install and rerun configure"; exit 1
 else
 libcacard.la: $(libcacard.lib-y) $(QEMU_OBJS_LIB)
-	$(call quiet-command,$(LIBTOOL) --mode=link --quiet --tag=CC $(CC) -rpath $(libdir) -o $@ $^ $(libcacard_libs) -lrt,"  lt LINK $@")
+	$(call quiet-command,$(LIBTOOL) --mode=link --quiet --tag=CC $(CC) -rpath $(libdir) -o $@ $^ $(libcacard_libs),"  lt LINK $@")
 
 libcacard.pc: $(libcacard_srcpath)/libcacard.pc.in
 	sed -e 's|@LIBDIR@|$(libdir)|' \