Fix uncompressed ipv6 netboot #1050

Job	Run time
f41 x64 build compile_commands.json	2m 47s
f39 x64 build	1m 58s
f40 x64 build	2m 2s
f41 x64 build	2m 15s
f39 ia32 build	1m 57s
centos8 x64 build	1m 18s
centos9 x64 build	1m 7s
f40 aa64 cross-build	2m 6s
f41 aa64 cross-build	2m 5s
f39 arm cross-build	1m 57s
centos8 ia32 build	1m 16s
f39 x64 cross-build	2m 7s
f40 x64 cross-build	2m 4s
f39 ia32 cross-build	2m 3s
f41 ia32 cross-build	2m 24s
f41 x64 cross-build	2m 2s
f40 ia32 cross-build	2m 2s
f41 arm cross-build	1m 57s
f40 arm cross-build	1m 56s
	37m 23s

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