build: remove the default useless MAINTAINER value

SVN-Revision: 34868

include/package-defaults.mk

@@ -13,8 +13,6 @@ else
   PKG_FIXUP_DEPENDS = $(2)
 endif
 
-PKG_MAINTAINER ?= OpenWrt Developers Team <[email protected]>
-
 define Package/Default
   CONFIGFILE:=
   SECTION:=opt