Revert "Fix settings display on macs"

This reverts commit 15425cb53e643a8c00975c1ef0ea7674464fdca2.
My analysis for the problem in 96ecd539de8e76a880f0013b4b8854da216e17b1 was wrong.
The actual issue is that QPalette inheritance appears broken on a mac; if you set the palette to the top widget container, it doesn’t do anything on its children. However, setting the palette to the main application itself does.

Now things look exactly the same between mac and linux for better or worse. Including font sizes and colors.
A downside, is that the selection color appears to be misused in most themes including the default. So you can't tell if a text is selected or simply having focus
Qt bug: QTBUG-32067, QTBUG-26144 (over 224 bugs related to palette use in Qt as of 2014-04-05)
Fix linking issues.

Spotted by Craig Treleaven, freetype linking parameters were added twice and too early, causing general linking with installed system libraries first, and then local tree ones.
Configure also automatically adds all libraries checked for to EXTRALIBS define
Fixes Video Playback Profile Editor.

Two corrected issues:
1- Adding or Editing an existing profile, did nothing visually, but would actually update the database
2- When deleting a profile, the newly selected one wasn’t actually saved as default

Was broken since 2007 by the look of things (feature first introduced in aaf6f2b5b1eee055074a72513ca819d97dd687cb)
Fixes #7004 and others