community/kyotocabinet: disable project's build-time compiler optimizations

This project uses -march=native by default, which causes problems when the package is built on a system with a newer ISA than the target CPUs. --disable-opt causes it to use the default -march in gcc, which should be something safe (right?)

In this particular case, it fixes an issue where the swpa instruction was being included by gcc, causing a SIGILL on CPUs (like the cortex A53) where this instruction is not supported. See: https://github.com/rinigus/osmscout-server/issues/345