Use Debian/ububtu patchset

dev-qt/qtwebkit/files/jscore_big_endian.diff

@@ -0,0 +1,28 @@
+Description: fix JSCore segmentation fault on 64-bit big endian systems
+ In CodeBlock.cpp the code preparing the operands of op_get_from_scope writes
+ the property offset as pointer size (hence 64 bit) value:
+ .
+ 2141: instructions[i + 6].u.pointer = reinterpret_cast<void*>(op.operand);
+ .
+ while the same slot is accessed later by the jitted code as 32 bit integer:
+ .
+ macro getProperty(slow)
+    loadisFromInstruction(6, t1)
+ .
+ This fails on big endian targets since the integer access takes the higher
+ part of the 64 bit value.
+Origin: backport, https://github.com/webkit/webkit/commit/3fdde71c7d95d758
+Reviewed-by: Frank Heimes <frank.heimes@canonical.com>
+Last-Update: 2021-11-24
+
+--- a/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm
++++ b/Source/JavaScriptCore/llint/LowLevelInterpreter64.asm
+@@ -2020,7 +2020,7 @@ macro loadWithStructureCheck(operand, sl
+ end
+ 
+ macro getProperty(slow)
+-    loadisFromInstruction(6, t1)
++    loadpFromInstruction(6, t1)
+     loadPropertyAtVariableOffset(t1, t0, t2, slow)
+     valueProfile(t2, 7, t0)
+     loadisFromInstruction(1, t0)