workarea now copies the zlib directory to the work area so changes

during configure and make don't affect the original.  correspondingly,
the distclean target in the generated root Makefile no longer runs
distclean in zlib.

original commit: e7436f657a54a2871519e887e485f53fbed2eded

makefiles/Makefile.in

@@ -32,6 +32,5 @@ clean:
 
 distclean:
 	rm -rf $(workarea)
-	(cd zlib ; make distclean)
 	rm -f Makefile
 	rm -f Make.out

workarea

@@ -128,13 +128,20 @@ workdir $W/mats
 (cd $W/mats; workln ../../mats/Mf-base Mf-base)
 (cd $W/mats; workln ../../mats/Mf-exobj Mf-exobj)
 
-for dir in `echo zlib examples unicode` ; do
+for dir in `echo examples unicode` ; do
   workdir $W/$dir
   for file in `(cd $dir ; echo *)` ; do
     (cd $W/$dir ; workln ../../$dir/$file $file)
   done
 done
 
+# deep copy submodules where builds occur so changes don't propagate through symlinks
+for dir in `echo zlib` ; do
+  if [ ! -e $W/$dir ] ; then
+    /bin/cp -R $dir $W/$dir
+  fi
+done
+
 workdir $W/boot
 workdir $W/boot/$M
 (cd $W/boot/$M; workln ../../../boot/$M/scheme.h scheme.h)