[add --ho option to regress to have it not clean the old ho files
John Meacham <john@repetae.net>**20070302075848] hunk ./regress/regress.prl 23
+my $opt_ho;
hunk ./regress/regress.prl 34
+    ho => \$opt_ho,
hunk ./regress/regress.prl 127
-        system "rm -f -- $cwd/*.ho $cwd/*_code.hs $cwd/*_code.c";
+        my $dh = $opt_ho ? "" : "$cwd/*.ho";
+        system "rm -f -- $dh $cwd/*_code.hs $cwd/*_code.c";
hunk ./regress/regress.prl 159
-            system "rm -f -- $cwd/$ln.ho";
+            system "rm -f -- $cwd/$ln.ho" unless $opt_ho;