docs/bpf: Document BPF_STRICT_BUILD=0 to tolerate test build failures

When the kernel config does not fully match the BPF selftest config
fragment, some tests may fail to compile. BPF_STRICT_BUILD (defaulting to
1) makes any such failure fatal. Mention the option so that developers are
aware they can set it to 0 to skip broken tests and keep the build going,
which is particularly useful during bringup or when testing on constrained
(e.g. distribution) configurations.

Signed-off-by: Ricardo B. Marlière <rbm@suse.com>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/bpf/20260706-b4-bpf_strict_build_docs-v1-1-5324d605c7b0@suse.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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