Removes win x86 target. Add win aarch64. Fixes to jump buffer sizes. Fix returning bool[2] in the SysV ABI. Array comparison now works. Prevent flexible array comparisons. Prevent zero size unions.

test/test_suite/struct/flex_array_comparison.c3

@@ -0,0 +1,15 @@
+module test;
+
+struct Abc
+{
+	int x;
+	int[*] y;
+}
+
+
+fn void test()
+{
+	Abc x;
+	Abc y;
+	bool same = x.y == y.y; // #error: does not support comparisons
+}