Update history with notes about used GCC
Update history with notes about used GCC

GCC 4.5.1 (TDM-1 release) is the one used to build all
versions of Ruby from now on (until something else is mentioned)

jaym/rubyinstaller,auyaauya/rubyinstaller,jahanzaibbahadur/rubyinstaller,leonhooijer/rubyinstaller,jahanzaibbahadur/rubyinstaller,jaym/rubyinstaller,haonaturel/rubyinstaller,suvarnaraju/rubyinstaller,jaym/rubyinstaller,suvarnaraju/rubyinstaller,vemmaverve/rubyinstaller,Rugbyman21/rubyinstaller,suvarnaraju/rubyinstaller,modulexcite/rubyinstaller,Rugbyman21/rubyinstaller,modulexcite/rubyinstaller,leonhooijer/rubyinstaller,zorosteven/rubyinstaller,haonaturel/rubyinstaller,shirosaki/rubyinstaller,shirosaki/rubyinstaller,vemmaverve/rubyinstaller,dreamauya/rubyinstaller,oneclick/rubyinstaller,shirosaki/rubyinstaller,leonhooijer/rubyinstaller,modulexcite/rubyinstaller,dreamauya/rubyinstaller,haonaturel/rubyinstaller,jahanzaibbahadur/rubyinstaller,auyaauya/rubyinstaller,auyaauya/rubyinstaller,Rugbyman21/rubyinstaller,oneclick/rubyinstaller,zorosteven/rubyinstaller,zorosteven/rubyinstaller,vemmaverve/rubyinstaller,oneclick/rubyinstaller,dreamauya/rubyinstaller