Ruby

win32.c: initialize with an impossible value

• win32/win32.c (getifaddrs, rb_w32_getppid): initialize the API
  pointers with an impossible value not to try everytime on old
  platforms.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55817 b2dd03c8-39d4-4d8f-98ff-823fe69b080e