Summary: mp3blaster 3.2.0-6 doesn't honor transparency

On KGI (http://www.kgi-project.net/), i'm unable to peruse the currently
set background for use with mp3blaster. This very same problem may (it
does indeed, i verified it) occur on X11 (for what that .... is worth;).

Attached patch to mp3blaster fixes it for me:

acconfig.h, configure.in
	* add detection of ncurses use_default_colors()
src/config.cc
	* peruse honor_transparent to set transparency if given in
	  the config-file and available in ncurses.
	* furthermore, use cached value[0]
src/main.cc
	* declare honor_transparent and peruse ncurses'
	  use_default_colors if available and requested.

Hi Bernhard,

thank you very much for your patch provided soooo long ago.  I had a
look into mp3blaster and tried to fix bugs tagged patch.  Unfortunately
your patch does not apply any more.  In case you are continuously
interested you might like to check the code at

https://salsa.debian.org/multimedia-team/mp3blaster/-/blob/master/debian/patches/mp3blaster-3.2.0_transparent.patch?ref_type=heads

and adapt it to the latest version.

Kind regards

     Andreas.