[CMake] cmake needs 2 runs to find boost

[Peter Steinbach]

Hi to all,

I tested this with cmake 3.2.2 and 3.3.2 and still get the same problem. 
I'd like to use boost with gcc on windows 7 64bit. I installed boost and gcc 
with msys2 as I cannot use MSVC for the actual project I am looking into for 
this.

the funny thing, if I use the attached CMakeLists.txt on the machine and call:
```
$ cmake -G "MSYS Makefiles" -DBOOST_ROOT=C:/msys64/mingw64 -
DBOOST_LIBRARYDIR==C:/msys64/mingw64/lib ..
-- The CXX compiler identification is GNU 4.9.2
-- Check for working CXX compiler: C:/msys64/usr/bin/g++.exe
-- Check for working CXX compiler: C:/msys64/usr/bin/g++.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
setting win specific stuff
CMake Error at C:/Program Files 
(x86)/CMake/share/cmake-3.2/Modules/FindBoost.cmake:1182 (message):
  Unable to find the requested Boost libraries.

  Boost version: 1.57.0

  Boost include path: C:/msys64/mingw64/include

  Could not find the following static Boost libraries:

          boost_filesystem
          boost_system

  No Boost libraries were found.  You may need to set BOOST_LIBRARYDIR to the
  directory containing Boost libraries or BOOST_ROOT to the location of
  Boost.
Call Stack (most recent call first):
  CMakeLists.txt:17 (FIND_PACKAGE)


CMake Error at CMakeLists.txt:24 (MESSAGE):
  Boost not found (C:/msys64/mingw64)


-- Configuring incomplete, errors occurred!
See also 
"C:/msys64/home/steinbac/development/cmake_sandbox/find_boost/build/CMakeFiles/CMakeOutput.log".
$ cmake -G "MSYS Makefiles" -DBOOST_ROOT=C:/msys64/mingw64 -
DBOOST_LIBRARYDIR==C:/msys64/mingw64/lib ..
setting win specific stuff
Boost 1.57 found __
-- Configuring done
-- Generating done
-- Build files have been written to: 
C:/msys64/home/steinbac/development/cmake_sandbox/find_boost/build
```

I'd like to link statically to multithreaded libboost_*-mt.a from my app. But 
it proofes really hard to find Boost in the first place.
Any ideas?

Peter

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