perf tools: Remove hardcoded include paths for elfutils

This change removes the use of hardcoded absolute "/usr/include/elfutils" paths
from the perf build.  The problem with hardcoded paths is that it prevents them
from being overridden by $prefix or by -I in CFLAGS (e.g., for cross-compiling
purposes).

Instead, just include the "elfutils/" subdirectory as a relative path when
files are needed from that directory.

Tested by building perf:
- Cross-compiled for ARM on x86_64
- Built natively on x86_64
- Built on x86_64 with /usr/include/elfutils moved to another location
  and manually included in CFLAGS

Acked-by: Masami Hiramatsu <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Robert Morell <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions