perf build: Remove all condition feature check {C,LD}FLAGS

perf build: Remove all condition feature check {C,LD}FLAGS

'make feature-dump' should give a stable result, so even 'NO_SOMETHING=1'
is given (for babeltrace, if LIBBABELTRACE=1 is not given), we should
try to detect those feature and {C,LD}FLAGS. Build or not should be
controled independent.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Link: http://lkml.kernel.org/r/1454047050-204993-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>