docs: fix include of ACL permissions files

The XSL generator loads included HTML files relative to the source dir
but we need to tell it to load them from the build dir instead.
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

docs/Makefile.am

@@ -293,6 +293,7 @@ EXTRA_DIST += \
 	    style=subsite.xsl; \
 	  fi; \
 	  $(XSLTPROC) --stringparam pagename $$name \
+	    --stringparam builddir '$(abs_top_builddir)' \
 	    --stringparam timestamp $(timestamp) --nonet \
 	    $(top_srcdir)/docs/$$style $< > $@ \
 	    || { rm $@ && exit 1; }

docs/newapi.xsl

@@ -22,7 +22,6 @@
   <!-- Build keys for all symbols -->
   <xsl:key name="symbols" match="/api/symbols/*" use="@name"/>
 
-  <xsl:param name="builddir" select="'..'"/>
   <xsl:param name="indexfile" select="'index.html'"/>
 
   <!-- the target directory for the HTML output -->

docs/page.xsl

@@ -7,6 +7,8 @@
   exclude-result-prefixes="xsl exsl html"
   version="1.0">
 
+  <xsl:param name="builddir" select="'..'"/>
+
   <xsl:template match="node() | @*" mode="content">
     <xsl:copy>
       <xsl:apply-templates select="node() | @*" mode="content"/>
@@ -168,7 +170,7 @@
 
   <xsl:template name="include">
     <xsl:variable name="inchtml">
-      <xsl:copy-of select="document(@filename)"/>
+      <xsl:copy-of select="document(concat($builddir, '/docs/', @filename))"/>
     </xsl:variable>
 
     <xsl:apply-templates select="exsl:node-set($inchtml)/html:html/html:body/*" mode="content"/>