Update to 1.4.48.  Add patches to fix build on OSX.

Changes since 1.4.46:

  * tcadb.cc (tcadbmisc): compilation warnings ware supressed.
  * tchdb.cc (tchdbfbpmerge): size checking was added.
  * tcbdb.cc (tcbdbrangeimpl): a bug of dead locking was fixed.
Updated databases/tokyocabinet to 1.4.48
Override the test for clang -R support as it gets broken by the
wrappers.
Don't pessimize the compilation by forcing per-function call pushs.
Override clang -R test, the wrappers drop -R/usr/lib.
Don't use -fforce-addr.