Mark generated PHP files as binary.

This will require a corresponding update in the `svn` repo.

Likely by setting the `svn:mime-type` `propset` attribute for each file
to `application/octet-stream`.

Author: dmsnell

.gitattributes

@@ -0,0 +1,5 @@
+/src/wp-includes/assets/script-loader-packages.min.php binary
+/src/wp-includes/assets/script-modules-packages.min.php binary
+/src/wp-includes/icons/** binary
+/src/wp-includes/blocks/*/view.asset.php binary
+/src/wp-includes/blocks/*/view.min.asset.php binary