src: introduce upx::max and friends; updates for clang-19 git snapshot

src/p_vmlinz.cpp

@@ -29,6 +29,7 @@
 #define ALLOW_INT_PLUS_MEMBUFFER 1
 #include "conf.h"
 
+#if (WITH_ZLIB)
 #include "p_elf.h"
 #include "file.h"
 #include "filter.h"
@@ -1071,4 +1072,6 @@ void PackVmlinuzARMEL::unpack(OutputFile *fo)
     }
 }
 
+#endif // WITH_ZLIB
+
 /* vim:set ts=4 sw=4 et: */