Drop (almost completely) the use of EOL2 and eol2 for support for lines that end in two characters, such as CR and LF, since
Linux needs only one (new line).
Finish (I hope) eliminiation of dual-character end-of-line support, leaving just EOL, which is new-line.
Drop DIRECT conditional assembly option in OSINT - no longer needed.
Drop OSINT conditional option DATECHECK
Drop OSINT conditional assembly option POLLING.
Drop OSINT conditional assembly USEFD0FD1 option since only supporting Linux/Unix.
Drop OSINT conditional option PIPES, since Linux always supports pipes.
Drop OSING conditional option EOT since EOT only needed for DOS support.
Drop OSINT conditional opton USEQUIT, since not needed for Linux.
Drop OSINT conditional option SAVEFILE since will always support save files on Linux.
Drop OSINT conditional option HOST386, since no need for it on Linux.
Drop OSINT conditional option EXECSAVE, since we will not use this feature for Linux (appending save file info to executable).
Drop use of tcc and musl.