catchsegv: Add an option to ignore modal dialogs.
catchsegv: Add an option to ignore modal dialogs.

Based on MaxGaspa's patch from
https://github.com/jrfonseca/drmingw/issues/53#issuecomment-748689204

jrfonseca/drmingw,jrfonseca/drmingw,jrfonseca/drmingw,jrfonseca/drmingw