Removed obsolete thumbnail dimension configuration setting

Makefile

@@ -1,4 +1,4 @@
-VERSION = git-20140927
+VERSION = git-20140928
 
 PREFIX    = /usr/local
 MANPREFIX = $(PREFIX)/share/man

config.def.h

@@ -50,12 +50,6 @@ static const bool ANTI_ALIAS = true;
  */
 static const bool ALPHA_LAYER = false;
 
-#endif
-#ifdef _THUMBS_CONFIG
-
-/* default dimension of thumbnails (width == height): */
-enum { THUMB_SIZE = 60 };
-
 #endif
 #ifdef _MAPPINGS_CONFIG