Actually fix compile with offset_ptr for real this time I hope?

src/dusk/offset_ptr.cpp

@@ -0,0 +1,28 @@
+#include "dusk/offset_ptr.h"
+
+#include "JSystem/JUtility/JUTAssert.h"
+
+#if TARGET_PC
+bool OffsetPtr::isRelocated() {
+    return value & 0x8000'0000;
+}
+
+bool OffsetPtr::setBase(void* base) {
+    JUT_ASSERT(__LINE__, value != 0);
+
+    if (isRelocated()) {
+        // Already relocated, don't touch it again!
+        return false;
+    }
+
+    ptrdiff_t diff = (u8*)this - (u8*)base;
+    ptrdiff_t newDiff = value - diff;
+    // Check that it's in range given that we use the 31st bit as a flag.
+    if (newDiff < -0x4000'0000 || newDiff > 0x7FFF'FFFF) {
+        OSPanic(__FILE__, __LINE__, "Not enough space in StageOffsetPtr!");
+    }
+
+    value = newDiff | 0x8000'0000;
+    return true;
+}
+#endif