Rewrite __crt1_startup ().
Old code:
1. Make our environment from dos environment.
2. Update LFN.
3. Read arguments.
Possibly, assuming LFN=y for response files, etc.
4. Read environment file (DJGPP.ENV).
Possibly, using __crt0_argv[0], obtained in 3rd step.
5. Update LFN.
6. ..., call `main'.
New code:
1. Make our environment from dos environment.
2. Find program name (from stub or PSP).
3. Read environment file (using program name from 2nd step).
4. Update LFN.
5. Read the rest of arguments.
6. ..., call `main'.