configure: Fix incorrect string comparison operator
In commit c97d6d2cdf97ed we accidentally added code to configure that uses '==' for string equality testing. This is a bashism -- the portable way to write this is '='. This fixes the "Unexpected operator error" complaint produced if the system /bin/sh is dash. Fixes: c97d6d2cdf97ed Reported-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 1515431442-23795-1-git-send-email-peter.maydell@linaro.org
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