tame: build-aux/{csv2xml,tdat2xml}: Remove xml-stylesheet XML PI

These declarations are relics from when all XML files could be loaded in the
browser to render the Summary Page.  Such a thing has not worked for many
years.

The previous commit will cause files produced by these scripts to be
regenerated.

I noticed this when reading source files using XIR.

DEV-10413

build-aux/csv2xml

@@ -62,7 +62,7 @@ BEGIN {
 
   # output package header
   printf \
-    "<?xml-stylesheet type=\"text/xsl\" href=\"%1$srater/summary.xsl\"?>\n" \
+    "<?xml version=\"1.0\"?>\n" \
     "<package\n" \
     "  xmlns=\"http://www.lovullo.com/rater\"\n" \
     "  xmlns:c=\"http://www.lovullo.com/calc\"\n" \

build-aux/tdat2xml

@@ -19,7 +19,7 @@
  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 ?>
-<?xml-stylesheet type="text/xsl" href="../../rater/summary.xsl"?>
+<?xml version="1.0"?>
 <lv:package
   xmlns:lv="http://www.lovullo.com/rater"
   xmlns:c="http://www.lovullo.com/calc"