[gtksourceview] language-specs: add 'text' to def.lang

[Christian Hergert <chergert src gnome org>]

commit 1b6afe1c18599deac1d3845d823f8c1225ed3274
Author: Christian Hergert <chergert redhat com>
Date:   Thu Feb 11 12:50:05 2021 -0800

    language-specs: add 'text' to def.lang
    
    This isn't ideal, but we do have specs which reference it already and can
    cause warnings. So might as well just add "text" which is unused to silence
    the warning in latex.lang.

 data/language-specs/def.lang | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/data/language-specs/def.lang b/data/language-specs/def.lang
index bbca26a8..443e6f9c 100644
--- a/data/language-specs/def.lang
+++ b/data/language-specs/def.lang
@@ -34,6 +34,9 @@
          Finally a style scheme may also define language
          specific styles. -->
 
+    <!-- General text, only currently used by Latex -->
+    <style id="text"                name="Text"/>
+
     <!-- Comment group -->
     <!-- Any comment -->
     <style id="comment"             name="Comment"/>