ecore-x: add ecore_x_keysym_get()

this is a less invasive solution for retrieving a keysym. X keysyms are
not portable, and so this function should not be used for any code which
is meant to run on other platforms.

@feature

src/lib/ecore_x/Ecore_X.h

@@ -2520,6 +2520,16 @@ EAPI const char    *ecore_x_keysym_string_get(int keysym);
  */
 EAPI int            ecore_x_keysym_keycode_get(const char *keyname);
 
+/**
+ * Return the X-specific keysym for a given key string
+ * @param string The key to get the keysym for
+ * @return the keysym value
+ *
+ * @since 1.15
+ * @note The returned value is not portable.
+ */
+EAPI unsigned int   ecore_x_keysym_get(const char *string);
+
 typedef struct _Ecore_X_Image Ecore_X_Image;
 
 EAPI Ecore_X_Image *ecore_x_image_new(int w, int h, Ecore_X_Visual vis, int depth);

src/lib/ecore_x/xcb/ecore_xcb_keymap.c

@@ -330,6 +330,12 @@ ecore_x_keysym_keycode_get(const char *keyname)
    return _ecore_xcb_keymap_string_to_keycode(keyname);
 }
 
+EAPI unsigned int
+ecore_x_keysym_get(const char *string)
+{
+   return _ecore_xcb_keymap_string_to_keysym(string);
+}
+
 /* local functions */
 static int
 _ecore_xcb_keymap_mask_get(void        *reply,

src/lib/ecore_x/xlib/ecore_x_test.c

@@ -165,3 +165,9 @@ ecore_x_keysym_keycode_get(const char *keyname)
 
    return keycode;
 }
+
+EAPI unsigned int
+ecore_x_keysym_get(const char *string)
+{
+   return XStringToKeysym(string);
+}