syscalls/profil: disable these tests for uClibc

uClibc doesn't have profiling support. It's necessary to define UCLIBC
environment variable with value 1 to prevent building of this test for
uClibc. This variable may be defined when calling make:

    make UCLIBC=1

Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
1 file changed