tcl8: add a backport from tcl 9.x that addresses Y2038 issues

Signed-off-by: Alexander Kanavin <[email protected]>

meta/recipes-devtools/tcltk8/tcl8/0001-generic-tcl.h-use-Tcl_WideInt-for-seconds-in-Tcl_Tim.patch

@@ -0,0 +1,27 @@
+From ff508f2e6786df697876140f21855ecb92a3ed36 Mon Sep 17 00:00:00 2001
+From: Alexander Kanavin <[email protected]>
+Date: Fri, 18 Aug 2023 12:25:11 +0200
+Subject: [PATCH] generic/tcl.h: use Tcl_WideInt for seconds in Tcl_Time
+
+This ensures the value will not overflow, particularly on 32 bit systems
+in 2038, where long will.
+
+Upstream-Status: Backport [https://core.tcl-lang.org/tcl/tktview/86dd172271]
+Signed-off-by: Alexander Kanavin <[email protected]>
+---
+ generic/tcl.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/generic/tcl.h b/generic/tcl.h
+index 3a4622e..6204c57 100644
+--- a/generic/tcl.h
++++ b/generic/tcl.h
+@@ -1418,7 +1418,7 @@ typedef enum {
+  */
+
+ typedef struct Tcl_Time {
+-    long sec;			/* Seconds. */
++    Tcl_WideInt sec;			/* Seconds. */
+     long usec;			/* Microseconds. */
+ } Tcl_Time;
+

meta/recipes-devtools/tcltk8/tcl8_8.6.15.bb

@@ -23,6 +23,7 @@ SRC_URI = "${BASE_SRC_URI} \
            file://alter-includedir.patch \
            file://interp.patch \
            file://run-ptest \
+           file://0001-generic-tcl.h-use-Tcl_WideInt-for-seconds-in-Tcl_Tim.patch \
            "
 SRC_URI[sha256sum] = "844775491e435e34d83d6ccfbadd1342f1855f1705253233a86152df0765e78d"