build.sh: Don't even clone marble if we don't build against it

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

scripts/build.sh

@@ -139,6 +139,7 @@ cd $SRC
 
 # build libssrfmarblewidget
 
+if [ $BUILD_MARBLE = 1 ]; then
 	if [ ! -d marble-source ] ; then
 		if [[ $1 = local ]] ; then
 			git clone $SRC/../marble-source marble-source
@@ -166,8 +167,9 @@ if [ $PLATFORM = Darwin ] ; then
 			echo "cannot find Qt 5.5 or 5.6 in ~/Qt"
 			exit 1
 		fi
+
 	fi
-if [ "$BUILDMARBLE" = "1" ] ; then
+
 	cmake -DCMAKE_BUILD_TYPE=Release -DQTONLY=TRUE -DQT5BUILD=ON \
 		-DCMAKE_INSTALL_PREFIX=$INSTALL_ROOT \
 		-DBUILD_MARBLE_TESTS=NO \