tools build: No need to make libapi for perf explicitly

tools build: No need to make libapi for perf explicitly

The perf build handles its dependencies by itself.

Also renaming libapi libapikfs to libapi as it got
changed just recently.

Signed-off-by: Jiri Olsa <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Norris <[email protected]>
Cc: David Ahern <[email protected]>
Cc: David Howells <[email protected]>
Cc: Michal Marek <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>