update dependencies in docker

docker/scripts/install-dependencies-soapysdr.sh

@@ -25,7 +25,8 @@ apt-get update
 apt-get -y install --no-install-recommends $STATIC_PACKAGES $BUILD_PACKAGES
 
 git clone https://github.com/pothosware/SoapySDR
-cmakebuild SoapySDR f722f9ce5b629c3c44401a9bf628b3f8e67a9695
+# latest from master as of 2020-09-04
+cmakebuild SoapySDR 580b94f3dad46899f34ec0a060dbb4534e844e57
 
 SUDO_FORCE_REMOVE=yes apt-get -y purge --autoremove $BUILD_PACKAGES
 apt-get clean