runqemu (which the test also runs) already performs this check,
and does it better, as it additionally unsets a number of environment
variables that can confuse and misdirect host's pkg-config.
(From OE-Core rev: ad179728a6978d929e2a876abe7e1cbd6b76a502)
Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>