codecs/isac: Use lrint for mingw toolchain.

This allows to use lrint for any mingw compiler targets.
4 jobs for fix-mingw in 1 minute and 29 seconds
latest
Status Job ID Name Coverage
  Container
passed #6231264
aarch64
build-container-aarch64

00:00:34

passed #6231263
build-container-x86_64

00:00:38

 
  Build
passed #6231266
aarch64
build-aarch64

00:00:44

passed #6231265
build-x86_64

00:00:50