Avoid fatal errors when opening a 64-bit GDBM database from a 32-bit

process (Ubuntu bug #1001189).
* libdb/db_gdbm.c (trap_error): New function.
  (man_gdbm_open_wrapper): Rearrange interface to call gdbm_open
  rather than taking its return value as an argument.  Fetch a test
  value from the database after opening it, inside a setjmp/longjmp
  guard to prevent GDBM from exiting.
* include/mydbm.h (man_gdbm_open_wrapper): Update prototype.
  (MYDBM_CTRWOPEN, MYDBM_CRWOPEN, MYDBM_RWOPEN, MYDBM_RDOPEN):
  Update man_gdbm_open_wrapper calls, since it now calls gdbm_open
  itself.
* NEWS: Document this.

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