disable PRS on linux (needs layout revamping)

Originally committed to SVN as r312.

core/posix/defines.h

@@ -21,6 +21,7 @@ typedef uint64_t __uint64;
 
 #define NO_SPELLCHECKER
 #define NO_FEX
+#define NO_PRS
 
 #if defined(HAVE_LIBAVCODEC) && defined(HAVE_LIBAVFORMAT)
 #define USE_LAVC

core/subtitle_format.cpp

@@ -130,7 +130,9 @@ void SubtitleFormat::LoadFormats () {
 		new ASSSubtitleFormat();
 		new SRTSubtitleFormat();
 		new TXTSubtitleFormat();
+#ifndef NO_PRS
 		new PRSSubtitleFormat();
+#endif
 	}
 	loaded = true;
 }

core/subtitle_format_prs.cpp

@@ -34,6 +34,8 @@
 //
 
 
+#ifndef NO_PRS
+
 ///////////
 // Headers
 #include <wx/image.h>
@@ -775,3 +777,5 @@ wxImage PRSSubtitleFormat::SubImageWithAlpha (wxImage &source,const wxRect &rect
 
     return image;
 }
+
+#endif /* NO_PRS */