Scilab example Makefiles update.

Make consistent with other languages.
Output is also suppressed when run from top level directory - see
RUNPIPE.

Examples/scilab/enum/Makefile

@@ -4,14 +4,12 @@ SRCS       = example.c
 TARGET     = example
 INTERFACE  = example.i
 
-all::
+check: build
+	$(MAKE) -f $(TOP)/Makefile scilab_run
+
+build:
 	$(MAKE) -f $(TOP)/Makefile SRCS='$(SRCS)' SWIG='$(SWIG)' \
 	TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' scilab
-	
 
-clean::
+clean:
 	$(MAKE) -f $(TOP)/Makefile scilab_clean
-	rm -f *.sce *.so lib*lib.c *_wrap.c
-
-check: all
-	$(MAKE) -f $(TOP)/Makefile scilab_run