Break up iOS get/tar commands to fix timeout

.travis.yml

@@ -132,7 +132,10 @@ install:
 
   # ios dependencies: qt
   - if [ "${SPEC}" = "macx-ios-clang" ]; then
-        wget --quiet https://s3-us-west-2.amazonaws.com/qgroundcontrol/dependencies/Qt5.9.3-ios-min.tar.bz2 &&
+        wget --quiet https://s3-us-west-2.amazonaws.com/qgroundcontrol/dependencies/Qt5.9.3-ios-min.tar.bz2
+        ;
+    fi
+  - if [ "${SPEC}" = "macx-ios-clang" ]; then
         tar jxf Qt5.9.3-ios-min.tar.bz2 -C /tmp &&
         export IOS_CCACHE_CC=`/usr/bin/xcrun -sdk iphoneos -find clang` &&
         export IOS_CCACHE_CXX=`/usr/bin/xcrun -sdk iphoneos -find clang++` &&