pkgconf improved compatibility with freedesktop.org pkg-config.
So, we don't need to unset PKG_CONFIG_SYSROOT_DIR in wrappers.
(From OE-Core rev: bff4ad7d6f62131a9b91a4063600e6f3edb8843c)
Signed-off-by: Maxin B. John <maxin.john@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
