upx_lzma_test_overlap() heuristic overlap_overhead up to 0xA00

src/compress_lzma.cpp

@@ -500,7 +500,10 @@ int upx_lzma_test_overlap  ( const upx_bytep buf, unsigned src_off,
 
     unsigned overlap_overhead = src_off + src_len - *dst_len;
     //printf("upx_lzma_test_overlap: %d\n", overlap_overhead);
-    if ((int)overlap_overhead >= 256)
+
+    // 2007-04-25 lower bound 0x810 using --lzma on
+    //    http://www.equi4.com/pub/tk/8.4.13/tclkit-linux-x86.gz
+    if ((int)overlap_overhead >= 0xa00)
         return UPX_E_OK;
 
     UNUSED(cresult);