update to 1.23
    
    - update to 1.23
    - re-apply following patches
      * 0001-Allow-leveldbjni-build.patch
      * 0002-Added-a-DB-SuspendCompations-and-DB-ResumeCompaction.patch
      * 0003-allow-Get-calls-to-avoid-copies-into-std-string.patch
      * 0004-bloom_test-failure-on-big-endian-archs.patch
      * 0005-Restore-soname-versioning-with-CMake-build.patch
    - drop patch already included in 1.23
      * 0006-Align-version-soversion-CMake-setup-closer-with-othe.patch
    - disable LEVELDB_BUILD_TESTS and LEVELDB_BUILD_BENCHMARKS,as the
      upstream dist tarball does not contain gtest and gmock sources.
    
    Signed-off-by: Kefu Chai <tchaikov@gmail.com>