windows-makefile.tmpl: clean up after DLL link failure.

Without proper cleanup after DLL link failure second attempt to
run nmake would actually proceed and failure will be "shifted" to
run time. This is because libcrypto.lib import library is generated
even if DLL link fails.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Configurations/windows-makefile.tmpl

@@ -360,7 +360,7 @@ $target: $deps $ordinalsfile $mkdef_pl
 	\$(PERL) $mkrc_pl $shlib$shlibext > $shlib.rc
 	\$(RC) \$(RCOUTFLAG)$shlib.res $shlib.rc
 	\$(LD) \$(LDFLAGS) \$(LIB_LDFLAGS) \\
-		/implib:$target \$(LDOUTFLAG)$shlib$shlibext /def:$shlib.def @<<
+		/implib:\$@ \$(LDOUTFLAG)$shlib$shlibext /def:$shlib.def @<< || (DEL /Q \$(\@B).* $shlib.* && EXIT 1)
 $objs $shlib.res$linklibs \$(EX_LIBS)
 <<
 	DEL /F apps\\$shlib$shlibext