ENH: remove verbosity from doxygen untarring

This significantly increases the log size, and is not very useful.

Author: dzenanz

scripts/dockcross-manylinux-download-cache-and-build-module-wheels.sh

@@ -7,12 +7,12 @@
 if [[ ! -f doxygen-1.8.11.linux.bin.tar.gz ]]; then
   mkdir tools
   curl https://data.kitware.com/api/v1/file/5c0aa4b18d777f2179dd0a71/download -o doxygen-1.8.11.linux.bin.tar.gz
-  tar -xvzf doxygen-1.8.11.linux.bin.tar.gz -C tools
+  tar -xzf doxygen-1.8.11.linux.bin.tar.gz -C tools
 fi
 # if doxygen tarball was cached, we need to unzip it
 if [[ ! -f ./tools/doxygen-1.8.11/bin/doxygen ]]; then
   mkdir tools
-  tar -xvzf doxygen-1.8.11.linux.bin.tar.gz -C tools
+  tar -xzf doxygen-1.8.11.linux.bin.tar.gz -C tools
 fi
 if [[ ! -f ./tools/doxygen-1.8.11/bin/doxygen ]]; then
   echo "ERROR: can not find required binary './tools/doxygen-1.8.11/bin/doxygen'"