perf tools: Do not ignore the default vmlinux.h

stable inclusion
from stable-v6.6.2
commit 517310f7ce3a3a2b10e4b9aca6605c5327c371d0
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8IW7G

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=517310f7ce3a3a2b10e4b9aca6605c5327c371d0



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[ Upstream commit 1f36b190ad2dea68e3a7e84b7b2f24ce8c4063ea ]

The recent change made it possible to generate vmlinux.h from BTF and
to ignore the file.  But we also have a minimal vmlinux.h that will be
used by default.  It should not be ignored by GIT.

Fixes: b7a2d774 ("perf build: Add ability to build with a generated vmlinux.h")
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202310110451.rvdUZJEY-lkp@intel.com/


Cc: oe-kbuild-all@lists.linux.dev
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>