package/asterisk: drop needless dependency on gtk+

Signed-off-by: Phil Sutter <phil@nwl.cc>

package/asterisk/Makefile

@@ -11,7 +11,7 @@ PKG_DESCR:=		open source pbx
 PKG_SECTION:=		net/voip
 PKG_DEPENDS:=		libncurses libpthread libopenssl libcurl libstdcxx
 PKG_DEPENDS+=		libsqlite
-PKG_BUILDDEP:=		autotool ncurses openssl zlib curl popt gtk+ libjansson
+PKG_BUILDDEP:=		autotool ncurses openssl zlib curl popt libjansson
 PKG_BUILDDEP+=		sqlite
 PKG_URL:=		http://www.asterisk.org/
 PKG_SITES:=		http://downloads.asterisk.org/pub/telephony/asterisk/releases/