elm: Add hack to make test case work

Because of the way elm_code test case is written, by directly including
the C file, we end up with two symbols for the internal _elm_legacy_add
flag. This makes some test case fail (after applying a pending patch).

Solution found by Sungtaek Hong.

elm_code test case needs to be fixed. Don't include the C files
directly, testing static inlines should be done through a common .x or
something, but not by including the C file itself. This has led and will
lead to many issues.

src/lib/elementary/elm_code_widget.c

@@ -24,7 +24,7 @@ typedef enum {
    ELM_CODE_WIDGET_COLOR_COUNT
 } Elm_Code_Widget_Colors;
 
-Eina_Unicode status_icons[] = {
+static Eina_Unicode status_icons[] = {
  ' ',
  ' ',
  ' ',

src/lib/elementary/elm_widget.h

@@ -813,7 +813,7 @@ _elm_widget_sub_object_redirect_to_top(Evas_Object *obj, Evas_Object *sobj)
 
 /* Internal hack to mark legacy objects as such before construction.
  * No need for TLS: Only UI objects created in the main loop matter. */
-EAPI Eina_Bool _elm_legacy_add;
+EAPI extern Eina_Bool _elm_legacy_add;
 #define elm_legacy_add(k, p, ...) ({ _elm_legacy_add = 1;  \
    efl_add(k, p, efl_canvas_object_legacy_ctor(efl_added), ##__VA_ARGS__); })