Makefile: Fix test_clean.

The recently added test_clean target was initially misisng a couple
of items, and became much more deficient with the addition of
the new test targets.  This fixes all that, as well as removing
some redundant entries from the main clean target.

TESTED:
All build products from test_all are now removed by test_clean.

Makefile

@@ -151,6 +151,7 @@ TESTOBJS_C      := $(patsubst %.c,%.o,$(TESTSRCS_C))
 TESTPRGS_C      := $(patsubst %.c,%,$(TESTSRCS_C))
 TESTSPRGS_C     := $(patsubst %.c,%_static,$(TESTSRCS_C))
 TESTSYSPRGS_C   := $(patsubst %.c,%_syslib,$(TESTSRCS_C))
+ALLTESTPRGS     := $(TESTPRGS_C) $(TESTSPRGS_C) $(TESTSYSPRGS_C)
 TESTRUNS        := $(patsubst \
                      $(TESTNAMEPREFIX)%,$(TESTRUNPREFIX)%,$(TESTPRGS_C))
 TESTSRUNS       := $(patsubst \
@@ -502,12 +503,13 @@ $(MANRUNPREFIX)clean:
 	$(RM) $(MANTESTDIR)/*.o $(MANTESTPRGS)
 
 test_clean: xtest_clean $(MANRUNPREFIX)clean
-	$(RM) $(TESTDIR)/*.o $(TESTPRGS) $(XTESTDIR)/*.o $(XTESTPRGS) $(XLIBPATH)
+	$(RM) $(TESTDIR)/*.o $(ALLTESTPRGS) $(XLIBPATH)
+	$(RM) test/test_cmath_* test/test_faccessat_setuid
 	@$(RMDIR) $(XLIBDIR)
 
 clean: $(MANRUNPREFIX)clean test_clean
 	$(RM) $(foreach D,$(SRCDIR),$D/*.o $D/*.o.* $D/*.d)
-	$(RM) $(BUILDDLIBPATH) $(BUILDSLIBPATH) $(BUILDSYSLIBPATH) $(TESTPRGS) test/test_cmath_* test/test_faccessat_setuid
+	$(RM) $(BUILDDLIBPATH) $(BUILDSLIBPATH) $(BUILDSYSLIBPATH)
 	@$(RMDIR) $(BUILDLIBDIR)
 
 .PHONY: all dlib syslib slib clean check test test_cmath xtest