Build/Test Tools: Ignore patch related files, so they can't be accidentally committed.

Merges [39360-39361] to the 4.7 branch.
See #52341.

git-svn-id: https://develop.svn.wordpress.org/branches/4.7@50205 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

.gitignore

@@ -15,7 +15,7 @@ wp-tests-config.php
 /npm-debug.log
 /build
 /tests/phpunit/build
-/wp-cli.local.yml 
+/wp-cli.local.yml
 
 # Files and folders that get created in wp-content
 /src/wp-content/blogs.dir
@@ -42,3 +42,9 @@ wp-tests-config.php
 
 # Ignore other .gitignore files to allow for personal customizations
 .gitignore
+
+# Files related to applying patches
+*.rej
+*.orig
+*.patch
+*.diff