tools: Make pkg-config dependency checks usable by other tools

tools: Make pkg-config dependency checks usable by other tools

Other tools, in tools/verification and tools/tracing, make use of
libtraceevent and libtracefs as dependencies. This allows setting
up the feature check flags for them as well.

Signed-off-by: Guilherme Amadio <amadio@gentoo.org>
Tested-by: Thorsten Leemhuis <linux@leemhuis.info>
Tested-by: Leo Yan <leo.yan@arm.com>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: linux-trace-devel@vger.kernel.org
Link: https://lore.kernel.org/r/20240717174739.186988-3-amadio@gentoo.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>