- "make_binary_distribution" accepts a dummy "--platform=" argument.

- "MySQL-shared-compat.spec" uses a "version40" define symbol internally.


scripts/make_binary_distribution.sh:
  Newer versions of the release build tools call this with a "--platform=" argument
  which we seem not to need in 4.0, but which makes the tool crash (happened on SCO).
  
  Rather than add another version check into the build tools, just accept a "--platform="
  argument and ignore it, just give a message.
support-files/MySQL-shared-compat.spec.sh:
  The current version of "Do-shared-compat" needs two digits to identify the release families
  (to differ between 4.0 and 4.1), so the variable "version4" must get renamed to "version40".