qtbase: remove obsolete icu dependency

Follow-up to 7eef8b4e29

src/qtbase.mk

@@ -8,7 +8,7 @@ $(PKG)_CHECKSUM := 3703c6a584193e759f5b9cbf0ea6022d685ab827
 $(PKG)_SUBDIR   := $(PKG)-opensource-src-$($(PKG)_VERSION)
 $(PKG)_FILE     := $(PKG)-opensource-src-$($(PKG)_VERSION).tar.xz
 $(PKG)_URL      := http://download.qt.io/official_releases/qt/5.4/$($(PKG)_VERSION)/submodules/$($(PKG)_FILE)
-$(PKG)_DEPS     := gcc postgresql freetds openssl harfbuzz zlib libpng jpeg sqlite pcre fontconfig freetype dbus icu4c
+$(PKG)_DEPS     := gcc postgresql freetds openssl harfbuzz zlib libpng jpeg sqlite pcre fontconfig freetype dbus
 
 define $(PKG)_UPDATE
     $(WGET) -q -O- http://download.qt-project.org/official_releases/qt/5.4/ | \