In order to actually use LMDB_LIBDIR, library_dirs have to be set to
extra_library_dirs.
Merge pull request #49 from bra-fsn/master

Make LMDB_LIBDIR working
Correct various doc inaccuracies (closes #51)
Remove unused stdbool.h.
C99 stdint.h for Visual Studio 2008.
Remove unused tgmath.h.
MSVC9 compat: remove inline declarations
Remove (broken) inlining control for MSVC.
Another volley of MSVC9 declaration fixes.
C89 comments.
MSVC9
MSVC9
Add memory usage section (closes #52)
LMDB_0.9.11 @ git://gitorious.org/mdb/mdb.git
0.78 initial changelog.
Remove old txnless test from dirtybench.
Require a non-ancient vesion of cffi.
Update ChangeLog.
Python3.x compatible examples.
Remove buffer hacks. Closes #38, closes #58