Add further types of garbage to .cvsignore and to "make clean"

[originally from svn r581]

.cvsignore

@@ -1,2 +1,3 @@
-*.pdb *.ilk *.res *.RES *.pch *.rsp *.obj *.exe
+*.pdb *.ilk *.res *.RES *.pch *.rsp *.obj *.exe *.ncb *.plg *.dsw *.opt *.dsp
+mkres mkres.exe
 Makefile.bor Makefile.cyg

Makefile

@@ -216,3 +216,8 @@ clean:
 	del *.ilk
 	del *.pdb
 	del *.rsp
+	del *.dsp
+	del *.dsw
+	del *.ncb
+	del *.opt
+	del *.plg