[gtksourceview] solarized-dark.xml: follow upstream styling closer

[Christian Hergert <chergert src gnome org>]

commit 1819491aefe90fc8613b0ff67aed69462ece42c6
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jan 14 12:09:26 2022 -0800

    solarized-dark.xml: follow upstream styling closer
    
    These are styled differently upstream in the VIM solarized module and we
    should probably be striving to follow that closer than we did previously.

 data/styles/solarized-dark.xml | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/data/styles/solarized-dark.xml b/data/styles/solarized-dark.xml
index 0b87f2a8..e175c5cc 100644
--- a/data/styles/solarized-dark.xml
+++ b/data/styles/solarized-dark.xml
@@ -82,6 +82,12 @@
   <!-- Identifiers -->
   <style name="def:identifier"              foreground="blue"/>
 
+  <!-- Functions -->
+  <style name="def:function"                foreground="blue"/>
+
+  <!-- Keywords -->
+  <style name="def:keyword"                 foreground="green"/>
+
   <!-- Statements -->
   <style name="def:statement"               foreground="orange"/>
 
@@ -121,4 +127,9 @@
   <style name="def:heading5"                scale="1.3"/>
   <style name="def:heading6"                scale="1.2"/>
   -->
+
+  <!-- C Overrides -->
+  <style name="c:preprocessor"              foreground="orange"/>
+  <style name="c:type-keyword"              foreground="yellow"/>
+
 </style-scheme>