fix stretch symlink

dockerbuild/Dockerfile.debian-stretch

@@ -20,7 +20,7 @@ WORKDIR /cmake-3.17.3
 RUN ./bootstrap && make -j8 && make install
 WORKDIR /
 RUN if test "$TARGETPLATFORM" = "linux/arm/v6"; then \
-    ln -s /lib/arm-linux-gnueabi/ld-2.30.so /lib/ld-linux-armhf.so.3; \
+    ln -s /lib/arm-linux-gnueabi/ld-2.24.so /lib/ld-linux-armhf.so.3; \
     fi;
 
 RUN groupadd -g 1000 jenkins-build && useradd -u 1000 -g 1000 jenkins-build