For CI - fix the housekeeping logic for the SF.net.

The old snapshots were not being removed in the correct order due to a bug in the housekeeping logic. Since we have more build artifacts per build now, reduce to only keep the build artifacts from the lasts 10 builds instead of 30.
Also generate 64-bit ARM RPM package using 'lib64' (suitable for RH/Fedora) for completeness sake.
[ci package]

.travis.yml

@@ -316,7 +316,7 @@ before_script:
   - if [[ $RELEASE_TAG ]] || (! [[ $TRAVIS_BRANCH =~ [^-]+-[^-]+-CI ]] && echo $COMMIT_MESSAGE |grep -cq '\[ci package\]'); then export PACKAGE_UPLOAD=1; fi
   - export PATH=$(whereis -b ccache |grep -o '\S*lib\S*'):${ARM_PREFIX%/*}:$PATH
   - rake ci_setup_cache
-script: rake ci && if [[ $PACKAGE_UPLOAD ]]; then rake ci_package_upload; fi && rake ci_timer
+script: rake ci && if [[ $PACKAGE_UPLOAD ]]; then rake ci_package_upload && if [[ "$SYSROOT" == "arm64-sysroot" ]]; then rake ci_package_upload URHO3D_USE_LIB64_RPM=1; fi; fi && rake ci_timer
 after_script: rake ci_teardown_cache
 
 ---

Rakefile

@@ -603,12 +603,12 @@ task :ci_package_upload do
       # Download source packages from GitHub
       system "export SNAPSHOT_VER=$(git describe $TRAVIS_COMMIT |ruby -pe 'gsub(/-(?!g)/, %q{.})'); wget -q https://github.com/$TRAVIS_REPO_SLUG/tarball/$TRAVIS_COMMIT -O Urho3D-$SNAPSHOT_VER-Source-snapshot.tar.gz && wget -q https://github.com/$TRAVIS_REPO_SLUG/zipball/$TRAVIS_COMMIT -O Urho3D-$SNAPSHOT_VER-Source-snapshot.zip" or abort 'Failed to get source packages'
       # Only keep the snapshots from the last 30 revisions
-      system "for v in $(sftp [email protected] <<EOF |tr ' ' '\n' |grep Urho3D- |cut -d '-' -f1,2 |uniq |tail -n +31
+      system "for v in $(sftp [email protected] <<EOF |tr ' ' '\n' |grep Urho3D- |cut -d '-' -f1,2 |uniq |tail -n +11
 cd #{upload_dir}
-ls -1r
+ls -1t
 bye
 EOF
-); do echo rm #{upload_dir}/${v}*; done |sftp -b - [email protected] >/dev/null 2>&1" or abort 'Failed to housekeep snapshots'
+); do echo rm #{upload_dir}/${v}-*; done |sftp -b - [email protected] >/dev/null 2>&1" or abort 'Failed to housekeep snapshots'
     end
   else
     upload_dir = "/home/frs/project/#{repo}/#{ENV['RELEASE_TAG']}"