perf tests: Show the inner make output when an error happens

Before:

  [acme@zoo linux]$ make -C tools/perf -f tests/make make_static
  make: Entering directory `/home/git/linux/tools/perf'
  - make_static: cd . && make -f Makefile DESTDIR=/tmp/tmp.JcWuM4Zu9f LDFLAGS=-static
  make: *** [make_static] Error 1
  make: Leaving directory `/home/git/linux/tools/perf'
  [acme@zoo linux]$

After:

  [acme@zoo linux]$ make -C tools/perf -f tests/make make_static
  make: Entering directory `/home/git/linux/tools/perf'
  - make_static: cd . && make -f Makefile DESTDIR=/tmp/tmp.X3su83i14u LDFLAGS=-static
  cd . && make -f Makefile DESTDIR=/tmp/tmp.X3su83i14u LDFLAGS=-static
    BUILD:   Doing 'make -j4' parallel build
  config/Makefile:303: *** No static glibc found, please install glibc-static.  Stop.
  make[1]: *** [all] Error 2
    test: test -x ./perf
  make: Leaving directory `/home/git/linux/tools/perf'
  [acme@zoo linux]$

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-h4kby5wyp6nfev3882rzm3r9@git.kernel.org


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