t / t5100 / patch0015on commit run_external_diff: use an argv_array for the environment (ae049c9)
   1---
   2diff --git a/foo b/foo
   3index e69de29..d95f3ad 100644
   4--- a/foo
   5+++ b/foo
   6@@ -0,0 +1 @@
   7+content
   8