BSD_CRTBEGIN is enabled on all archs (except sparc64) and non-BSD csu will be removed along with gcc 4.2.1.
This change will not be committed until one of the following is true:
- someone adds sparc64 support to BSD_CRTBEGIN
- we reach the gcc 4.2.1 removal date and leave sparc64 broken
- there is a decision to proceed with this earlier than gcc 4.2.1 removal, leaving sparc64 broken but with the hope that it gets fixed