Log Message:
Update to 3.10.21, and fix build on current (statvfs lossage).
Changes since 3.10.20:
        *  arj_arcv.c, arj_file.c, arj_proc.c, arj_user.c, arjtypes.c,
           environ.c, externs.c, externs.h, makefile:
           Merged with the remaining part of TCO fixes to make up for 3.10.21
        *  defines.h, encode.c, environ.c, environ.h, fmemcmp.asm, misc.c,
           rearj.c: Resync with TCO to close any outstanding bugs
        *  arj.c: Rudimentary Borland code caused the filenames in argv[] to
           be mishandled under Win32
        *  register.c: REGISTER might fail due to _fput_* changes