fix CONFIG_QEMU_HELPERDIR generation again
commit 38f419f3 fixed a breakage with CONFIG_QEMU_HELPERDIR which has been introduced by 8bf188aa. But while techinically that fix has been correct, all other similar variables are handled differently. Make it consistent, and let scripts/create_config expand and capitalize the variable properly like for all other qemu_*dir variables. Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
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