enable docker ppp

hc

2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87

 kernel/tools/testing/selftests/powerpc/vphn/Makefile
..
..
@@ -1,6 +1,7 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 TEST_GEN_PROGS := test-vphn
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-CFLAGS += -m64
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+CFLAGS += -m64 -I$(CURDIR)
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 top_srcdir = ../../../../..
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 include ../../lib.mk