Patch configure so that we dont need a seperate spec file for x86_64. Pass info about desired GCC version from configure to the spec file/target config and use it to select the version of GCC built as part of crosstools. fix the spec file to include gcc's headers in the search path, aswell as find libstdc++ when linking. Seperate the auto-linked libs into their own file in lib/auto so that it can be easily modified apart from the main spec file.
git-svn-id: https://svn.aros.org/svn/aros/trunk/AROS@48762 fb15a70f-31f2-0310-bbcc-cdcc74a49acc