efl_config: Fix type of returned value (EO)

An ugly const char * is returned from strdup, freed later with a custom
function that just calls free(). This was probably intended for
stringshare but now free is used. We have to fix the free function for
the EO API so let's keep free(). I'd rather avoid declaring
elm_config_profile_dir_free in the EO files.

src/lib/elementary/efl_config_global.eo

@@ -66,7 +66,7 @@ class Efl.Config.Global (Efl.Object, Efl.Config)
             is_user: bool; [[$true to lookup for a user profile or $false for
                              a system one.]]
          }
-         return: own(stringshare); [[Directory of the profile]]
+         return: own(string); [[Directory of the profile, free after use.]]
       }
       profile_derived_add @protected {
          [[Add a new profile of the given name to be derived from the current

src/lib/elementary/elm_config.c

@@ -937,6 +937,7 @@ _elm_config_profile_dir_get(const char *prof,
 
    _elm_config_user_dir_snprintf(buf, sizeof(buf), "config/%s", prof);
 
+   // See elm_config_profile_dir_free: always use strdup+free
    if (ecore_file_is_dir(buf))
      return strdup(buf);
 
@@ -945,6 +946,7 @@ _elm_config_profile_dir_get(const char *prof,
 not_user:
    snprintf(buf, sizeof(buf), "%s/config/%s", _elm_data_dir, prof);
 
+   // See elm_config_profile_dir_free: always use strdup+free
    if (ecore_file_is_dir(buf))
      return strdup(buf);
 
@@ -2793,6 +2795,7 @@ elm_config_profile_dir_get(const char *profile,
 EAPI void
 elm_config_profile_dir_free(const char *p_dir)
 {
+   // Don't change this: EO relies on free() to be used.
    free((void *)p_dir);
 }