[PATCH liburing v1 1/2] tests: fix bpf ops build error

[Haiyue Wang <haiyuewa@163.com>]

If removed the previous install by 'rm -rf /usr/include/liburing', the
test build will fail:

make[1]: Entering directory '/root/linux/liburing/test'
     CC helpers.o
mkdir -p output/bpf
     CC output/bpf/nops.bpf.o
mkdir -p output/bpf
     CC output/bpf/cp.bpf.o
In file included from /root/linux/liburing/test/bpf-progs/nops.bpf.c:2:
/root/linux/liburing/test/bpf-progs/../bpf_defs.h:9:10: fatal error: 'liburing/io_uring.h' file not found
    9 | #include "liburing/io_uring.h"
      |          ^~~~~~~~~~~~~~~~~~~~~
1 error generated.
make[1]: *** [Makefile:387: output/bpf/nops.bpf.o] Error 1
make[1]: *** Waiting for unfinished jobs....
In file included from /root/linux/liburing/test/bpf-progs/cp.bpf.c:2:
/root/linux/liburing/test/bpf-progs/../bpf_defs.h:9:10: fatal error: 'liburing/io_uring.h' file not found
    9 | #include "liburing/io_uring.h"
      |          ^~~~~~~~~~~~~~~~~~~~~
1 error generated.
make[1]: *** [Makefile:387: output/bpf/cp.bpf.o] Error 1
make[1]: Leaving directory '/root/linux/liburing/test'
make: *** [Makefile:14: all] Error 2

Add the include option in 'CPPFLAGS' for bpf build.

Fixes: fd8a6e66c739 ("tests: test io_uring bpf ops")
Signed-off-by: Haiyue Wang <haiyuewa@163.com>
---
 test/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/Makefile b/test/Makefile
index bcb97da1..05e1f9e9 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -385,6 +385,7 @@ CLANG_BPF_SYS_INCLUDES ?= $(shell $(CLANG) -v -E - </dev/null 2>&1 \
 $(BPF_OUTPUT)/%.bpf.o: $(BPF_PROGS_DIR)/%.bpf.c $(wildcard %.h)
 	mkdir -p ${BPF_OUTPUT}
 	$(QUIET_CC)$(CLANG) -g -O2 -target bpf \
+		     -I../src/include/ \
 		     -I$(BPF_OUTPUT) $(CLANG_BPF_SYS_INCLUDES) \
 		     -Wno-missing-declarations \
 		     -c $(filter %.c,$^) -o $(patsubst %.bpf.o,%.tmp.bpf.o,$@) -mcpu=v4
-- 
2.54.0