gnu: docbook-xml: Use XSLT to patch catalog.xml.

(sxml transforms) are unsuited here due to guile-bug #20339.

* gnu/packages/aux-files/xml/patch-catalog-xml.xsl: New file.
* Makefile.am: Register it.
* gnu/packages/docbook.scm (docbook-xml-5)[native-inputs]: Add libxslt.
[arguments]: Add phase to patch catalog.xml using XSLT.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/Makefile.am b/Makefile.am
index 8c505d8cd31..645026a9ba7 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -436,7 +436,8 @@ AUX_FILES =						\
   gnu/packages/aux-files/python/sanity-check.py         \
   gnu/packages/aux-files/python/sitecustomize.py        \
   gnu/packages/aux-files/renpy/renpy.in \
-  gnu/packages/aux-files/run-in-namespace.c
+  gnu/packages/aux-files/run-in-namespace.c             \
+  gnu/packages/aux-files/xml/patch-catalog-xml.xsl
 
 # Templates, examples.
 EXAMPLES =                                      \