tools lib api: Clean up install_headers

Add missing backslash that caused an install command to always appear
in build output. Make the install headers more specific.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Hao Luo <haoluo@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nicolas Schier <nicolas@fjasle.eu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <song@kernel.org>
Cc: Stanislav Fomichev <sdf@google.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20221117004356.279422-2-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/api/Makefile

@@ -100,12 +100,12 @@ install_lib: $(LIBFILE)
 		cp -fpR $(LIBFILE) $(DESTDIR)$(libdir_SQ)
 
 install_headers:
-	$(call QUIET_INSTALL, headers) \
+	$(call QUIET_INSTALL, libapi_headers) \
 		$(call do_install,cpu.h,$(prefix)/include/api,644); \
 		$(call do_install,debug.h,$(prefix)/include/api,644); \
 		$(call do_install,io.h,$(prefix)/include/api,644); \
 		$(call do_install,fd/array.h,$(prefix)/include/api/fd,644); \
-		$(call do_install,fs/fs.h,$(prefix)/include/api/fs,644);
+		$(call do_install,fs/fs.h,$(prefix)/include/api/fs,644); \
 		$(call do_install,fs/tracing_path.h,$(prefix)/include/api/fs,644);
 
 install: install_lib install_headers