[LyX/2.2.x] Set default output format to XeTeX in Arabic docs

[Scott Kostyshak]

commit e8464083fe8ab54dc4580b319ae7504245b38503
Author: Scott Kostyshak <skost...@lyx.org>
Date:   Sun Nov 13 22:42:18 2016 -0500

    Set default output format to XeTeX in Arabic docs
    
    All other exports to PDF fail.
---
 lib/doc/ar/Intro.lyx     |    2 +-
 lib/doc/ar/Shortcuts.lyx |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/doc/ar/Intro.lyx b/lib/doc/ar/Intro.lyx
index 4c6b1e3..114294f 100644
--- a/lib/doc/ar/Intro.lyx
+++ b/lib/doc/ar/Intro.lyx
@@ -42,7 +42,7 @@
 \font_sf_scale 100 100
 \font_tt_scale 100 100
 \graphics default
-\default_output_format default
+\default_output_format pdf4
 \output_sync 0
 \bibtex_command default
 \index_command default
diff --git a/lib/doc/ar/Shortcuts.lyx b/lib/doc/ar/Shortcuts.lyx
index bacb0f7..584d59c 100644
--- a/lib/doc/ar/Shortcuts.lyx
+++ b/lib/doc/ar/Shortcuts.lyx
@@ -22,7 +22,7 @@
 \font_sf_scale 100 100
 \font_tt_scale 100 100
 \graphics default
-\default_output_format default
+\default_output_format pdf4
 \output_sync 0
 \bibtex_command default
 \index_command default