hdf5-native: Fix recipe task signature

The task signature for hdf5-native:do_unpack is currently machine specific
due to the use of qemu. This isn't used in the native case but the do_unpack
task was being compromised. Fix this by adding a class-native override.

This helps ensure yocto-check-layer passes for layers referencing meta-oe.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/hdf5/hdf5_1.14.4-3.bb

@@ -37,6 +37,7 @@ $qemu_binary "\$@"
 EOF
         chmod +x ${WORKDIR}/qemuwrapper
 }
+gen_emu:class-native = ""
 
 do_unpack[postfuncs] += "gen_emu"