Speed up ext/dba/tests/bug78808.phpt

This tests takes about 2 minutes on AppVeyor CI, what is super slow.
The problem is that we're doing 50,000 inserts of small keys and values
inst

Speed up ext/dba/tests/bug78808.phpt

This tests takes about 2 minutes on AppVeyor CI, what is super slow.
The problem is that we're doing 50,000 inserts of small keys and values
instead of only few inserts with large values, what basically has the
same effect regarding the mmap size.

Closes GH-7073.

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Fix #78808: [LMDB] MDB_MAP_FULL: Environment mapsize limit reached

We implement support for a fifth parameter, which allows to specify the
mapsize. The parameter defaults to zero, in wh

Fix #78808: [LMDB] MDB_MAP_FULL: Environment mapsize limit reached

We implement support for a fifth parameter, which allows to specify the
mapsize. The parameter defaults to zero, in which case the compiled in
default mapsize (usually 1048576) will be used. The mapsize should be
a multiple of the page size of the OS.

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