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

* js/maint-1.6.0-exec-path-env:
  Propagate --exec-path setting to external commands via GIT_EXEC_PATH

exec_cmd.c

@@ -61,6 +61,10 @@ const char *git_extract_argv0_path(const char *argv0)
 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);
 }