Fix build makefiles

test/Makefile.tests

@@ -1,5 +1,11 @@
 include $(TOPDIR)/Makefile.config
+
 USERLIB = $(TOPDIR)/userlib
+
+AS = $(RISCV_AS) -c
+GCC = $(RISCV_GCC)
+LD = $(RISCV_LD)
+
 INCPATH += -I$(TOPDIR) -I$(USERLIB)
 LDFLAGS = $(RISCV_LDFLAGS) -T $(USERLIB)/ldscript.lds
 ASFLAGS = $(RISCV_ASFLAGS) $(INCPATH)
@@ -7,16 +13,16 @@ CFLAGS  = $(RISCV_CFLAGS) $(INCPATH)
 
 # Rules
 %.o: %.s
-	$(RISCV_AS) $(ASFLAGS) -c $<
+	$(AS) $(ASFLAGS) -c $<
 
 %.o: %.c
-	$(RISCV_GCC) $(CFLAGS) -c $<
+	$(GCC) $(CFLAGS) -c $<
 
 %.dump: %.o
 	$(RISCV_OBJCOPY) -j .text -O $(DUMP_FORMAT) $< $@
 
 %.guac: %.o
-	$(RISCV_LD) $(LDFLAGS) $+ -o $@
+	$(LD) $(LDFLAGS) $+ -o $@
 
 # Dependencies
 .%.d: %.s
@@ -31,6 +37,9 @@ CFLAGS  = $(RISCV_CFLAGS) $(INCPATH)
 		| sed '\''s/\($*\)\.o[ :]*/\1.o $@ : /g'\'' > $@; \
 		[ -s $@ ] || rm -f $@'
 
+$(PROGRAMS):
+	$(LD) $(LDFLAGS) $+ -o $@
+
 # Targets
 #clean:
 #	rm -rf *.o 2> /dev/null