[FS#909] runas wrapper executes programs using wrong interpreter

[LEDE Bugs]

The following task has a new comment added:

FS#909 - runas wrapper executes programs using wrong interpreter
User who did this - Kirill Elagin (kirelagin)

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Actually, now I’ve got a similar issue, but this time with `mksquashfs4`, which needs `zlib`.

[staging_dir/host]$ ./lib/ld-linux-x86-64.so.2 --library-path lib/ ./bin/.mksquashfs4.bin mksquashfs4
(works)

[staging_dir/host]$ ./lib/ld-linux-x86-64.so.2 --library-path lib/ lib/runas ./bin/.mksquashfs4.bin mksquashfs4
mksquashfs4: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=909#comment4693