Get rid of '__builtin_bswap' functions
Get rid of '__builtin_bswap' functions

- It is hard to generally use __builtin_bswap functions across
multiple platforms.

wurikiji/forestdb,joliss/forestdb,uvenum/forestdb,couchbase/forestdb,joliss/forestdb,sushmaad/forestdb,jinxuan/forestdb,yyangpan/forestdb,seem-sky/forestdb,seem-sky/forestdb,zhaog/forestdb,jinxuan/forestdb,uvenum/forestdb,nvoron23/forestdb,hisundar/forestdb,zhaog/forestdb,sushmaad/forestdb,yyangpan/forestdb,nvoron23/forestdb,couchbase/forestdb,hisundar/forestdb,wurikiji/forestdb