[LyX/master] Configure: remove the old docbook format, no more useful.

[Thibaut Cuvelier]

commit 738dccbff472c5144c0a3691af1fba1209bf5f9e
Author: Thibaut Cuvelier <tcuvelier at lyx.org>
Date:   Thu Jan 28 05:16:33 2021 +0100

    Configure: remove the old docbook format, no more useful.
---
 lib/configure.py |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/lib/configure.py b/lib/configure.py
index 152844f..2c72050 100644
--- a/lib/configure.py
+++ b/lib/configure.py
@@ -1270,7 +1270,6 @@ def checkConverterEntries():
 \converter klyx       lyx        "python -tt $$s/lyx2lyx/lyx2lyx -c euc_kr -o $$o $$i"	""
 \converter lyxpreview png        "python -tt $$s/scripts/lyxpreview2bitmap.py --png"	""
 \converter lyxpreview ppm        "python -tt $$s/scripts/lyxpreview2bitmap.py --ppm"	""
-\converter docbook    docbook5   "cp $$i $$o"	"xml"
 ''')