update build shell scripts

guowenxue

2020-08-21 425fd0cea02d9b6705df14dcb4589be6e624d867

 3rdparty/imageMagick/build.sh

@@ -89,6 +89,11 @@
    cd -
}

if [ ! -f ${PREFIX_PATH}/lib/libz.so ] ; then
    cd ../zlib
    ./build.sh
    cd -
fi

export_cross