D19332: KProcess compile fix for obsolete QProcess members in 5.13

[Jonathan Marten]

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REVISION SUMMARY
  The functions QProcess::setReadChannelMode() and QProcess::readChannelMode() are obsolete, but were not specially treated in any way in earlier Qt versions.  In 5.13 they are actually disabled in the header files, using QT_DEPRECATED_SINCE(5, 13).  KDE PIM optimistically sets QT_DISABLE_DEPRECATED_BEFORE=0x060000 (since May 2017), so the build fails because these functions are no longer available:
  
  /usr/include/KF5/KCoreAddons/kprocess.h:332: error: no members matching 'QProcess::setReadChannelMode' in 'class QProcess'
  /usr/include/KF5/KCoreAddons/kprocess.h:333: error: no members matching 'QProcess::readChannelMode' in 'class QProcess'
  
  This does not affect the remainder of Frameworks or Plasma (yet), because they do not use this QT_DISABLE_DEPRECATED_BEFORE setting.
  
  This change makes the use of these two members conditional on the Qt version (5.12 or earlier).

TEST PLAN
  Built kcoreaddons with this change, checked that applications using this header build correctly without the above errors.

REPOSITORY
  R244 KCoreAddons

REVISION DETAIL
  https://phabricator.kde.org/D19332

AFFECTED FILES
  src/lib/io/kprocess.h

To: marten, #frameworks
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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