config: Add env var to skip profile save

This only skips writing the profile name to
  ~/.e/e/config/profile.cfg

This allows easier testing of E with custom profiles.
Note that this goes together with another patch in elementary, but the
env var is different (note: we could use a single one). This is only
meant for debugging.

export E_CONF_PROFILE_NOSAVE=1

src/bin/e_config.c

@@ -1956,8 +1956,12 @@ e_config_profile_save(void)
 {
    Eet_File *ef;
    char buf[4096], buf2[4096];
+   const char *s;
    int ok = 0;
 
+   if ((s = getenv("E_CONF_PROFILE_NOSAVE")) && atoi(s))
+     return 1;
+
    /* FIXME: check for other sessions fo E running */
    e_user_dir_concat_static(buf, "config/profile.cfg");
    e_user_dir_concat_static(buf2, "config/profile.cfg.tmp");