[OpenSmalltalk/opensmalltalk-vm] 1a4fbe: Upgrade minimum minheadless SDK to 10.11 on OSX

 
  Branch: refs/heads/Cog
  Home:   https://github.com/OpenSmalltalk/opensmalltalk-vm
  Commit: 1a4fbe34725f528208706ee643dd14a8e5bb4413
      https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/1a4fbe34725f528208706ee643dd14a8e5bb4413
  Author: Nicolas Cellier <[hidden email]>
  Date:   2020-03-25 (Wed, 25 Mar 2020)

  Changed paths:
    M build.minheadless.cmake/x64/common/configure_variant.sh
    M build.minheadless.cmake/x86/common/configure_variant.sh

  Log Message:
  -----------
  Upgrade minimum minheadless SDK to 10.11 on OSX

Indeed, if we want to use `NSMutableArray<NSString*>`, then it can only work with SDK delivered with Xcode >= 7
Otherwise there is a compilation error:

>opensmalltalk-vm/platforms/minheadless/mac/sqMain.m:38:5: error: type arguments cannot be applied to
>      non-parameterized class 'NSMutableArray'
>    NSMutableArray<NSString*> *filesToOpen;
>    ^             ~~~~~~~~~~~