scripts: adjust url to Coverity tools

The URL to the Coverity tools download has changed; the old one points
to an obsolete version that is not supported anymore.  Adjust to point
to the correct and supported tools.

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

scripts/coverity-scan/run-coverity-scan

@@ -116,14 +116,14 @@ update_coverity_tools () {
     cd "$COVERITY_TOOL_BASE"
 
     echo "Checking for new version of coverity build tools..."
-    wget https://scan.coverity.com/download/linux64 --post-data "token=$COVERITY_TOKEN&project=$PROJNAME&md5=1" -O coverity_tool.md5.new
+    wget https://scan.coverity.com/download/cxx/linux64 --post-data "token=$COVERITY_TOKEN&project=$PROJNAME&md5=1" -O coverity_tool.md5.new
 
     if ! cmp -s coverity_tool.md5 coverity_tool.md5.new; then
         # out of date md5 or no md5: download new build tool
         # blow away the old build tool
         echo "Downloading coverity build tools..."
         rm -rf coverity_tool coverity_tool.tgz
-        wget https://scan.coverity.com/download/linux64 --post-data "token=$COVERITY_TOKEN&project=$PROJNAME" -O coverity_tool.tgz
+        wget https://scan.coverity.com/download/cxx/linux64 --post-data "token=$COVERITY_TOKEN&project=$PROJNAME" -O coverity_tool.tgz
         if ! (cat coverity_tool.md5.new; echo "  coverity_tool.tgz") | md5sum -c --status; then
             echo "Downloaded tarball didn't match md5sum!"
             exit 1