[PATCH 10/12] tools lib bpf: Change FEATURE-DUMP to FEATURE-DUMP.libbpf

From: Yunlong Song Commit ed63f34c026e9a60d17fa750ecdfe3f600d49393 ("perf tools: Make perf depend on libbpf") triggers the build of libbpf when building the perf tools, dynamically creating FEATURE-DUMP.libbpf. It failed to update the tools/lib/bpf/.gitignore file to have that prefix, fix it.

[PATCH 10/12] tools lib bpf: Change FEATURE-DUMP to FEATURE-DUMP.libbpf

From: Yunlong Song Commit ed63f34c026e9a60d17fa750ecdfe3f600d49393 ("perf tools: Make perf depend on libbpf") triggers the build of libbpf when building the perf tools, dynamically creating FEATURE-DUMP.libbpf. It failed to update the tools/lib/bpf/.gitignore file to