kbuild: replace KBUILD_SRCTREE with boolean building_out_of_srctree
Commit 25b146c5 ("kbuild: allow Kbuild to start from any directory") deprecated KBUILD_SRCTREE. It is only used in tools/testing/selftest/ to distinguish out-of-tree build. Replace it with a new boolean flag, building_out_of_srctree. I also replaced the conditional ($(srctree),.) because the next commit will allow an absolute path to be used for $(srctree) even when building in the source tree. Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
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