Remove -DMOZ_MAIL_NEWS from build system.

Bug #66543 r=pavlov

config/mac/ComponentConfig.h

@@ -37,7 +37,6 @@
 	#define MOZ_COMMUNICATOR_CONFIG_JS
 	#define MOZ_SPELLCHK
 #else	/* The WHOLE enchilada */
-	#define MOZ_MAIL_NEWS
 	#define EDITOR
 	#define MOZ_OFFLINE
 	#define MOZ_LOC_INDEP

configure.in

@@ -2910,9 +2910,6 @@ MOZ_MAIL_NEWS=1
 MOZ_ARG_DISABLE_BOOL(mailnews,
 [  --disable-mailnews      Disable building of mail & news components],
   MOZ_MAIL_NEWS= )
-if test "$MOZ_MAIL_NEWS"; then
-  AC_DEFINE(MOZ_MAIL_NEWS)
-fi
 AC_SUBST(MOZ_MAIL_NEWS)
 
 dnl Turn on the new lightweight gfx text control frames