Retain xsl:* node namespace declarations

xsl:copy retains them, but a copy isn't being done here; the author copied
all attributes and nodes, but didn't catch namespace declarations.  Nor
would most people (or I); this came up when I was trying to test namespace
manipulation.

* src/compiler/generate-tests-helper.xsl (test:create-xslt-generator xsl:*):
  Copy namespace::*

src/compiler/generate-tests-helper.xsl

@@ -104,6 +104,8 @@
 
 <xsl:template match="xsl:*" mode="test:create-xslt-generator">
   <xsl:element name="__x:{ local-name() }">
+    <!-- xsl:copy would normally retain namespace declarations -->
+    <xsl:sequence select="namespace::*" />
     <xsl:apply-templates select="@*|node()" mode="test:create-xslt-generator"/>
   </xsl:element>
 </xsl:template>