master 58454b6615: Add portable versions of the outline SVGs

[Po Lu]

branch: master
commit 58454b661578bb56d8feccb1b0340b94869f0655
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Add portable versions of the outline SVGs
    
    * lisp/outline.el (outline-open):
    (outline-close): Add PBM images.
    
    * etc/images/outline-open.pbm:
    * etc/images/outline-close.pbm: New images used on systems
    without librsvg.
---
 etc/images/outline-close.pbm | Bin 0 -> 39 bytes
 etc/images/outline-open.pbm  | Bin 0 -> 39 bytes
 lisp/outline.el              |   2 ++
 3 files changed, 2 insertions(+)

diff --git a/etc/images/outline-close.pbm b/etc/images/outline-close.pbm
new file mode 100644
index 0000000000..b37b640b55
Binary files /dev/null and b/etc/images/outline-close.pbm differ
diff --git a/etc/images/outline-open.pbm b/etc/images/outline-open.pbm
new file mode 100644
index 0000000000..06b520f14c
Binary files /dev/null and b/etc/images/outline-open.pbm differ
diff --git a/lisp/outline.el b/lisp/outline.el
index aee6f696b5..25f3b21e63 100644
--- a/lisp/outline.el
+++ b/lisp/outline.el
@@ -294,6 +294,7 @@ buffers (yet) -- that will be amended in a future version."
 
 (define-icon outline-open nil
   '((image "outline-open.svg" :height 15 :ascent center)
+    (image "outline-open.pbm" :height 15 :ascent center)
     (emoji "🔽")
     (symbol " ▼ ")
     (text " open "))
@@ -303,6 +304,7 @@ buffers (yet) -- that will be amended in a future version."
 
 (define-icon outline-close nil
   '((image "outline-close.svg" :height 15 :ascent center)
+    (image "outline-close.pbm" :height 15 :ascent center)
     (emoji "▶️")
     (symbol " ▶ ")
     (text " close "))