Merge branch 'js/maint-1.6.0-exec-path-env' into maint-1.6.1

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

diff --combined exec_cmd.c
index cdd35f91954bdc751455e1083a0612a21eeadc67,589059f026bcecae99469c4514efdcfa9542e28b..351fec2e9e374eacaeba88d2a7dddf11f5e331ce
--- 1/exec_cmd.c
--- 2/exec_cmd.c
+++ b/exec_cmd.c
@@@ -25,6 -25,10 +25,10 @@@ void git_set_argv0_path(const char *pat
  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);
  }
  
  
@@@ -59,7 -63,9 +63,7 @@@ static void add_path(struct strbuf *out
  void setup_path(void)
  {
        const char *old_path = getenv("PATH");
 -      struct strbuf new_path;
 -
 -      strbuf_init(&new_path, 0);
 +      struct strbuf new_path = STRBUF_INIT;
  
        add_path(&new_path, argv_exec_path);
        add_path(&new_path, getenv(EXEC_PATH_ENVIRONMENT));