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configure: fix POSIX compatibility issue
When running configure script from 2.5.0-rc4 on OpenBSD-current (amd64), I get the following error:
./configure[4756]: ${nettle:+($nettle_version)}": bad substitution
*** Error 1 in . (/usr/ports/infrastructure/mk/bsd.port.mk:2747 '/usr/ports/pobj/qemu-2.5.0rc4/.configure_done')
*** Error 1 in /usr/ports/openbsd-wip/emulators/qemu (/usr/ports/infrastructure/mk/bsd.port.mk:2491 'configure')
Indeed, construct "${nettle:+($nettle_version)}" does not conform to POSIX Shell Command Language. The attached patch fixes the issue.
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