[PATCH] selftests: ptp: include default header install path

[Grygorii Strashko]

Add the usr/include subdirectory of the top-level tree to the include
path to fix build when cross compiling for ARM.
testptp.c: In function 'main':
testptp.c:289:15: error: 'struct ptp_clock_caps' has no member named 'cross_timestamping'
           caps.cross_timestamping);

Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
---
 tools/testing/selftests/ptp/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/ptp/Makefile b/tools/testing/selftests/ptp/Makefile
index 83dd42b..d4064c7 100644
--- a/tools/testing/selftests/ptp/Makefile
+++ b/tools/testing/selftests/ptp/Makefile
@@ -1,3 +1,4 @@
+CFLAGS += -I../../../../usr/include/
 TEST_PROGS := testptp
 LDLIBS += -lrt
 all: $(TEST_PROGS)
-- 
2.10.1