Merge branch 'js/maint-1.6.0-exec-path-env'

* js/maint-1.6.0-exec-path-env:
  Propagate --exec-path setting to external commands via GIT_EXEC_PATH
diff --git a/exec_cmd.c b/exec_cmd.c
index 217c125..408e4e5 100644
--- a/exec_cmd.c
+++ b/exec_cmd.c
@@ -61,6 +61,10 @@
 void git_set_argv_exec_path(const char *exec_path)
 {
 	argv_exec_path = exec_path;
+	/*
+	 * Propagate this setting to external programs.
+	 */
+	setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
 }