- Suffix like "-m2", "-rc" becomes part of version as "_m2", "_rc".
- Release counts from 1, not 0.

This is done for both the "generic" RPMs and the "shared-compat" ones.
It includes introducing a new version variable "MYSQL_U_SCORE_VERSION"
in "configure.in", where the dash is replaced by an underscore:
  5.5.1-m2   ->  5.5.1_m2