build: Avoid phony `pixman` target in test/Makefile.win32

Instead of explicitly depending on "pixman" for the "all" and "check"
targets, rely on the dependency to the .lib file

Signed-off-by: Andrea Canciani <ranma42@gmail.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
diff --git a/test/Makefile.win32 b/test/Makefile.win32
index 6cfb4a7..bdd9b7f 100644
--- a/test/Makefile.win32
+++ b/test/Makefile.win32
@@ -16,9 +16,9 @@
 TESTS   = $(patsubst %,   $(CFG_VAR)/%.exe, $(TESTPROGRAMS))
 OTHERS  = $(patsubst %,   $(CFG_VAR)/%.exe, $(OTHERPROGRAMS))
 
-all: pixman inform $(TESTS) $(OTHERS)
+all: inform $(TESTS) $(OTHERS)
 
-check: pixman inform $(TESTS)
+check: inform $(TESTS)
 	@failures=0 ; \
 	total=0 ; \
 	for test in $(TESTS) ; \
@@ -46,9 +46,7 @@
 $(CFG_VAR)/%.exe: $(CFG_VAR)/%.obj $(TEST_LDADD)
 	@$(LD) $(PIXMAN_LDFLAGS) -OUT:$@ $^
 
-$(top_builddir)/pixman/$(CFG_VAR)/$(LIBRARY).lib: pixman
-
-pixman:
+$(top_builddir)/pixman/$(CFG_VAR)/$(LIBRARY).lib:
 	@$(MAKE) -C $(top_builddir)/pixman -f Makefile.win32
 
-.PHONY: all check pixman
+.PHONY: all check