[MacPorts] #58497: Don't check os_major on Linux

[MacPorts]

#58497: Don't check os_major on Linux
-------------------------+--------------------
 Reporter:  yan12125     |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:
 Keywords:               |       Port:
-------------------------+--------------------
 I've just upgrade my server from Linux kernel 4.18.16 to kernel 5.1.2, and
 the `port` command refuses to work:
 {{{
 Error: Current platform "linux 5" does not match expected platform "linux
 4"
 Error: If you upgraded your OS, please follow the migration instructions:
 https://trac.macports.org/wiki/Migration
 OS platform mismatch
     while executing
 "mportinit ui_options global_options global_variations"
 Error: /opt/local/bin/port: Failed to initialize MacPorts, OS platform
 mismatch
 }}}

 This check is not necessary on Linux IMO as programs compiled on Linux 4.x
 should work just fine on Linux 5.x. Need to change this line:
 https://github.com/macports/macports-
 base/blob/v2.5.4/src/macports1.0/macports.tcl#L703

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Ticket URL: <https://trac.macports.org/ticket/58497>
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