Merge bitcoin#15411: travis: Combine --disable-bip70 into existing job

eeeee58 travis: Combine --disable-bip70 into existing job (MarcoFalke)

Pull request description:

  We already have too many jobs, so instead of creating a separate job for the `--disable-bip70` configue option, combine it into an existing job

Tree-SHA512: 9e2fae73d90cb55b588c545bc118a14eba064f17fffd9b302c3fdbb8715e2319db03eac92ae51b3c16481f28a004a1c964dab75ca80a213e87574da8f73e3207

.travis.yml

@@ -242,7 +242,7 @@ after_success:
         HOST=i686-pc-linux-gnu
         PACKAGES="g++-multilib python3-zmq"
         GOAL="install"
-        BITCOIN_CONFIG="--enable-zmq --enable-glibc-back-compat --enable-reduce-exports LDFLAGS=-static-libstdc++"
+        BITCOIN_CONFIG="--enable-zmq --with-gui=qt5 --disable-bip70 --enable-glibc-back-compat --enable-reduce-exports LDFLAGS=-static-libstdc++"
         CONFIG_SHELL="/bin/dash"
 # x86_64 Linux (uses qt5 dev package instead of depends Qt to speed up build and avoid timeout)
     - stage: test