um: Fix for relative objtree when generating x86 headers
In an O= build, rely on the generated Makefile to call the main Makefile properly. When building in the source tree, we do not need to specify the -C and O= either. This fixes the problem when $(objtree) is a relative path and the -C changes the directory. Reported-by: NRichard Weinberger <richard.weinberger@gmail.com> Signed-off-by: NMichal Marek <mmarek@suse.cz>
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