More visibility for PackHeader when debug(-D)

modified:   packhead.cpp
	modified:   packmast.cpp
	modified:   pefile.h

src/packhead.cpp

@@ -181,6 +181,10 @@ bool PackHeader::fillPackHeader(const upx_bytep buf, int blen) {
     level = p[7];
     filter_cto = 0;
 
+    if (opt->debug.debug_level) {
+        fprintf(stderr, "  fillPackHeader  version=%d  format=%d  method=%d  level=%d\n",
+            version, format, method, level);
+    }
     const int size = getPackHeaderSize();
     if (boff + size <= 0 || boff + size > blen)
         throwCantUnpack("header corrupted 2");