make wxKeyEvent could get unicode key under x11, add a x11 keysym--unicode char map tab

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77846 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/unix/utilsx11.h

@@ -30,6 +30,13 @@ typedef unsigned long WXKeySym;
 
 int wxCharCodeXToWX(WXKeySym keySym);
 WXKeySym wxCharCodeWXToX(int id);
+int wxUnicodeCharXToWX(WXKeySym keySym);
+
+// Xlib keysym-unicode charactor pair
+struct CodePair {
+    unsigned int keySym;
+    int uniChar;
+};
 
 class wxIconBundle;