Rollup merge of rust-lang#57858 - pietroalbini:ignore-eol-images, r=GuillaumeGomez

Ignore line ending on older git versions

On Ubuntu 16.04 git 2.7.4 tries to fix the line ending of `.png` and `.ico` files, and obviously it ruins them. This PR adds an attribute to those files to ignore which line ending they use.

r? @GuillaumeGomez

Author: Centril

.gitattributes

@@ -9,3 +9,7 @@ src/etc/installer/gfx/* binary
 *.woff binary
 src/vendor/** -text
 Cargo.lock -merge linguist-generated=false
+
+# Older git versions try to fix line endings on images, this prevents it.
+*.png binary
+*.ico binary