new icon: llvm (line)

In the discussion of PR #2264 @Snailedlt developed a line version of the
icon. As the original icon it had thinner outside lines than lines
within the icon.
This has been fixed by me through Selection->Grow in Gimp that I applied
only on the outside of the icon.

Authored-by: Jørgen Kalsnes Hagen @Snailedlt
Co-authored-by: Fini Jastrow <ulf.fini.jastrow@desy.de>
Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

Author: Finii

devicon.json

@@ -7047,7 +7047,8 @@
         "versions": {
             "svg": [
                 "original",
-                "plain"
+                "plain",
+                "line"
             ],
             "font": [
                 "plain"