Make xsltproc more usable standalone.

	* tools/xsltproc.jam (xslt-xsltproc): Bind STYLESHEET.
	(xslt-xsltproc-dir): Likewise.

Thanks to Eric Woodruff for the bug report.


[SVN r44067]

tools/build

@@ -1 +1 @@
-Subproject commit df70c1065a020ae2d66e05dacbb42021ecee8d03
+Subproject commit ca078a9f8406bfd0d87404ba47e526bb86fc321b