Define #system_echo and #system_raw on all systems
#12352
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Follow-up to #12294. The breaking changes are:
#noecho!and#raw!returnnilinstead ofLibC.tcsetattr's return value;*_from_tc_mode!macros are now deprecated.Later we should probably deprecate
Termiosas well, since it is now only used from withinsrc/crystal/system/unix/file_descriptor.cr.I have no idea if these functions make sense on WASI. They are left unimplemented.