In imx-boot's Makefile, it downloads a native tool mkimage_uboot and
executes it, but this native tool requires libssl.so.1.1, which is in
${STAGING_LIBDIR_NATIVE}, we need set LD_LIBRARY_PATH to include it, or
it might run into following errors:
| ./mkimage_uboot -E -p 0x3000 -f u-boot.its u-boot.itb
| ./mkimage_uboot: error while loading shared libraries: libssl.so.1.1: cannot open shared object file: No such file or directory
