allow asterisk to compile for other then glibc

package/asterisk/Makefile

@@ -15,8 +15,6 @@ PKG_BUILDDEP:=		ncurses openssl zlib curl popt libjansson sqlite
 PKG_URL:=		http://www.asterisk.org/
 PKG_SITES:=		http://downloads.asterisk.org/pub/telephony/asterisk/releases/
 
-PKG_LIBC_DEPENDS:=	glibc
-
 DISTFILES:=		${PKG_NAME}-${PKG_VERSION}.tar.gz
 
 PKG_SUBPKGS:=		ASTERISK ASTERISK_PGSQL ASTERISK_VOICEMAIL ASTERISK_SOUNDS