Copy rather than symlink the test data.

This is needed because Windows doesn't support symlinks.

The Cygwin/MinGW build now passes "make test".

crypto/evp/Makefile.ssl

@@ -70,7 +70,7 @@ links:
 	@$(TOP)/util/point.sh Makefile.ssl Makefile
 	@$(PERL) $(TOP)/util/mklink.pl ../../include/openssl $(EXHEADER)
 	@$(PERL) $(TOP)/util/mklink.pl ../../test $(TEST)
-	@$(PERL) $(TOP)/util/mklink.pl ../../test $(TESTDATA)
+	cp $(TESTDATA) ../../test
 	@$(PERL) $(TOP)/util/mklink.pl ../../apps $(APPS)
 
 install: