Makefile: Update clean target for stb

stb leaves a bunch of files around even after clean.  Fix this.

Signed-off-by: Michael Neuling <mikey@neuling.org>
[stewart@linux.vnet.ibm.com: use explicit TARGET rather than *.stb]
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

Makefile.main

@@ -278,7 +278,7 @@ clean:
 	$(RM) *.[odsa] $(SUBDIRS:%=%/*.[odsa])
 	$(RM) *.elf $(TARGET).lid *.map $(TARGET).lds $(TARGET).lid.xz
 	$(RM) include/asm-offsets.h version.c .version
-	$(RM) extract-gcov
+	$(RM) extract-gcov $(TARGET).lid.stb $(TARGET).lid.xz.stb
 
 distclean: clean
 	$(RM) *~ $(SUBDIRS:%=%/*~) include/*~

libstb/Makefile.inc

@@ -16,3 +16,8 @@ $(LIBSTB): $(LIBSTB_OBJS:%=$(LIBSTB_DIR)/%) $(DRIVERS) $(TSS)
 libstb/create-container: libstb/create-container.c
 	$(call Q, HOSTCC ,$(HOSTCC) $(HOSTCFLAGS) \
 	-Wpadded -O0 -g -I$(SRC) -I$(SRC)/include -o $@ $<,$<)
+
+clean: create-container-clean
+
+create-container-clean:
+	$(RM) libstb/create-container