build: check_symbols: Fix bashishm
build: check_symbols: Fix bashishm

Reported-by: Petr Baudis <2df6472652419df7dced808d07835f28963a653f@ucw.cz>
Signed-off-by: Cyril Hrubis <b1e90efd3b808b8e0bcf2a9a55fd8b9a779bfd81@ucw.cz>

gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim,gfxprim/gfxprim