net-p2p/bitcoin-qt: Drop qt4 USE flag (Qt4 still used if USE=-qt5)

net-p2p/bitcoin-qt/bitcoin-qt-0.13.1-r1.ebuild

@@ -6,7 +6,7 @@ EAPI=5
 
 BITCOINCORE_COMMITHASH="03422e564b552c1d3c16ae854f8471f7cb39e25d"
 BITCOINCORE_LJR_DATE="20161027"
-BITCOINCORE_IUSE="dbus kde +libevent ljr +qrcode qt4 qt5 +http test +tor upnp +wallet zeromq"
+BITCOINCORE_IUSE="dbus kde +libevent ljr +qrcode qt5 +http test +tor upnp +wallet zeromq"
 BITCOINCORE_POLICY_PATCHES="+rbf spamfilter"
 LANGS="af af_ZA ar be_BY bg bg_BG ca ca@valencia ca_ES cs cs_CZ cy da de el el_GR en en_GB eo es es_AR es_CL es_CO es_DO es_ES es_MX es_UY es_VE et eu_ES fa fa_IR fi fr fr_CA fr_FR gl he hi_IN hr hu id_ID it it_IT ja ka kk_KZ ko_KR ku_IQ ky la lt lv_LV mk_MK mn ms_MY nb ne nl nl_NL pam pl pt_BR pt_PT ro ro_RO ru ru_RU sk sl_SI sq sr sr@latin sv ta th_TH tr tr_TR uk ur_PK uz@Cyrl vi vi_VN zh zh_CN zh_HK zh_TW"
 KNOTS_LANGS="nl_NL"
@@ -24,10 +24,10 @@ RDEPEND="
  qrcode? (
  media-gfx/qrencode
  )
- qt4? ( dev-qt/qtcore:4[ssl] dev-qt/qtgui:4 )
+ !qt5? ( dev-qt/qtcore:4[ssl] dev-qt/qtgui:4 )
  qt5? ( dev-qt/qtgui:5 dev-qt/qtnetwork:5 dev-qt/qtwidgets:5 )
  dbus? (
- qt4? ( dev-qt/qtdbus:4 )
+ !qt5? ( dev-qt/qtdbus:4 )
  qt5? ( dev-qt/qtdbus:5 )
  )
 "
@@ -38,7 +38,7 @@ DEPEND="${RDEPEND}
  media-gfx/imagemagick[png]
  )
 "
-REQUIRED_USE="^^ ( qt4 qt5 )
+REQUIRED_USE="
  http? ( libevent ) tor? ( libevent ) libevent? ( http tor )
  !libevent? ( ljr )
 "