Fix bug that threw an error while searching for linux headers through a symlink #1638

Job	Run time
env-protect-setup	4s
authorize	1s
get-dev-image / get-image	5s
generate-matrix	3m 18s
clang-tidy	7m 58s
code-coverage	0s
build-and-test (BPF opt (4.14.254), kvm, --config=qemu-bpf --compilation_mode=opt --//bazel/test_...	10m 32s
build-and-test (BPF opt (6.1.18), kvm, --config=qemu-bpf --compilation_mode=opt --//bazel/test_ru...	10m 27s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	7m 33s
build-and-test (Clang debug, nokvm, --config=clang --compilation_mode=dbg, bazel_buildables_clang...	7m 5s
build-and-test (ASAN, nokvm, --config=asan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	7m 6s
build-and-test (TSAN, nokvm, --config=tsan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	6m 55s
build-and-test (GCC opt, nokvm, --config=gcc --compilation_mode=opt, bazel_buildables_gcc_opt, ba...	9m 1s
build-and-test (Go race detector, nokvm, --config=go_race --compilation_mode=opt, bazel_buildable...	3m 15s
build-and-test-status	1s
	1h 13m 21s

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