Fix copying of files, rsync is more reliable (and preserves attributes)

build_classlibs_osx.pl

@@ -112,7 +112,7 @@ chdir ($root);
 $File::Copy::Recursive::CopyLink = 0;  #make sure we copy files as files and not as symlinks, as TC unfortunately doesn't pick up symlinks.
 
 mkpath("$libmono/2.0");
-dircopy("$monoprefix/lib/mono/2.0","$libmono/2.0");
+system("rsync -aPL $monoprefix/lib/mono/2.0 $libmono/.");
 # system("rm $libmono/2.0/*.mdb");
 mkpath("$libmono/micro");
 system("cp $root/mcs/class/lib/monotouch/mscorlib.dll $libmono/micro") eq 0 or die("Failed to copy micro corlib");