[MacPorts] #60465: textmate2: Portfile does not parse properly on older systems

[MacPorts]

#60465: textmate2: Portfile does not parse properly on older systems
--------------------+------------------------
 Reporter:  kencu   |      Owner:  neverpanic
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  textmate2
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 This is on 10.6.8, have not surveyed all systems for cutoff for error.

 {{{
 Error: Unable to determine location of a macOS SDK.
 Error: Unable to determine location of a macOS SDK.
 Error: Unable to determine location of a macOS SDK.
 Failed to parse file editors/textmate2/Portfile: can't read
 "configure.compiler": can't read "compiler.fallback": can't read
 "configure.sdkroot": Unable to determine location of a macOS SDK.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/60465>
MacPorts <https://www.macports.org/>
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