Whitespace cleanup of all Makefiles*

- some of the %.clean rules in the test-suite Makefiles were using a single tab
  as an empty rule, dangerous! I've replaced these with the safer '@exit 0'.

Examples/test-suite/guile/Makefile.in

@@ -14,9 +14,9 @@ GUILE        = @GUILE@
 GUILE_RUNTIME=
 
 C_TEST_CASES = long_long \
-               list_vector \
-               multivalue \
-               pointer_in_out
+	       list_vector \
+	       multivalue \
+	       pointer_in_out
 
 
 include $(srcdir)/../common.mk
@@ -28,7 +28,7 @@ INCLUDES    += -I$(top_srcdir)/$(EXAMPLES)/$(TEST_SUITE)/guile
 %.multicpptest: SWIGOPT += $(GUILE_RUNTIME)
 
 # Rules for the different types of tests
-%.cpptest: 
+%.cpptest:
 	$(setup)
 	+$(swig_and_compile_cpp)
 	$(run_testcase)
@@ -38,7 +38,7 @@ INCLUDES    += -I$(top_srcdir)/$(EXAMPLES)/$(TEST_SUITE)/guile
 	+$(swig_and_compile_c)
 	$(run_testcase)
 
-%.multicpptest: 
+%.multicpptest:
 	$(setup)
 	+$(swig_and_compile_multi_cpp)
 	$(run_testcase)