D28062: Fix compiler warnings

[Aleix Pol Gonzalez]

apol marked an inline comment as done.
apol added inline comments.

INLINE COMMENTS

> zzag wrote in main_wayland.cpp:262-263
> Could you please walk me through this change? Why do we need to call setProgram()?

`void start(const QString &command, OpenMode mode = ReadWrite);` is deprecated.

We could also use
`void start(const QString &program, const QStringList &arguments, OpenMode mode = ReadWrite);`

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D28062

To: apol, #kwin
Cc: zzag, kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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