Fix issue with testing of the help message header files.

In order for all definitions to be checked properly, we cannot rely
on config.h, but must assure that all conditional symbolic constants
are defined.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36817 b3059339-0415-0410-9bf9-f77b7e298cf2
Don't unnecessarily stop Win32 GUI playback.

There is no reason to do so in the preferences dialog.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36818 b3059339-0415-0410-9bf9-f77b7e298cf2
Show message box only if necessary.

Don't show it when entering the preferences,
but when confirming new preferences.

This is less annoying.

Additionally, rename control variable.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36819 b3059339-0415-0410-9bf9-f77b7e298cf2
Make message box less annoying.

Show information that playback needs restart only during playback.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36820 b3059339-0415-0410-9bf9-f77b7e298cf2
Cosmetic: Adjust indent.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@36821 b3059339-0415-0410-9bf9-f77b7e298cf2