[strace/strace] building strace with buildroot fails when a toolchain is installed on the system (#150)

[Dmitry V. Levin]

> 	D="" \
> 	READELF="/srv/storage/hthiery/buildroot/output/host/bin/aarch64-buildroot-linux-gnu-readelf" \
> 	CC="arm-linux-gnueabi-gcc" \
> 	CFLAGS="-DHAVE_CONFIG_H   -I./linux/aarch64 -I./linux/aarch64 -I./linux -I./linux -I. -I.      -DMPERS_IS_m32" \
> 	CPP="/srv/storage/hthiery/buildroot/output/host/bin/aarch64-buildroot-linux-gnu-cpp" \
> 	CPPFLAGS="-DHAVE_CONFIG_H   -I./linux/aarch64 -I./linux/aarch64 -I./linux -I./linux -I. -I.      -DIN_MPERS -DMPERS_IS_m32" \
> 	./mpers.sh m32 "-std=gnu99 " $f || exit; \

CPP doesn't match CC, this doesn't look correct.

> mpers-m32/kernel_v4l2_buffer_t.c:16:23: error: invalid application of 'sizeof' to incomplete type 'struct v4l2_meta_format'

Apparently, here it uses host kernel headers instead of the target ones, and the former don't provide a definition of struct v4l2_meta_format while the latter do.

This is likely a strace configure issue.

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