locale: add Japanese backslash key with rdp scancode 7D and X key name AE13

Correct values for the keyboard fields in Client Core Data is required too.

include/freerdp/keyboard_scancode.h

@@ -211,6 +211,7 @@ typedef uint32 RDP_SCANCODE;	/* Our own representation of a RDP protocol scancod
 /* #define RDP_SCANCODE_OEM_CLEAR                VK_OEM_CLEAR */
 
 #define RDP_SCANCODE_RETURN_KP         mk_rdp_scancode(0x1C, true) /* not RDP_SCANCODE_RETURN */
+#define RDP_SCANCODE_BACKSLASH_JP      mk_rdp_scancode(0x7D, false) /* JP OEM_5 ('\') */
 
 /* _not_ valid scancode, but this is what a windows PKBDLLHOOKSTRUCT for NumLock contains */
 #define RDP_SCANCODE_NUMLOCK_EXTENDED  mk_rdp_scancode(0x45, true)  /* should be RDP_SCANCODE_NUMLOCK */

libfreerdp-locale/keyboard_xkbfile.c

@@ -146,7 +146,8 @@ XKB_KEY_NAME_SCANCODE XKB_KEY_NAME_SCANCODE_TABLE[] =
 	{ "COMP",	RDP_SCANCODE_APPS},
 	{ "KPDV",	RDP_SCANCODE_DIVIDE}, // KP!
 	{ "RCTL",	RDP_SCANCODE_RCONTROL},
-	{ "RALT",	RDP_SCANCODE_RMENU}
+	{ "RALT",	RDP_SCANCODE_RMENU},
+	{ "AE13",	RDP_SCANCODE_BACKSLASH_JP} // JP
 /*	{ "LVL3",	0x54} */
 };