perf tools: Fix GNU make v3.80 compatibility issue

According to Documentation/Changes, the kernel should be buildable with
GNU make 3.80+. tools/perf/config/utilities.mak contains the "$(or"
construct, which requires make 3.81.  This causes "make" to fail on
systems with GNU make 3.80.

Replace "$(or" with an equivalent "$(if" expression, to restore backward
compatibility. Also fix an issue where _get_attempt was called with only
one argument. This prevented the error message from printing the name of
the variable that can be used to fix the problem.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1357680156-15520-1-git-send-email-alcooperx@gmail.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>