Julia: remove the lib copy hacks

With libflags this is not needed anymore.
Bump Boost version to 1.55.0, since 1.51.0 has issues on Cygwin.
Add zlib to build dependencies for Boost.
Disable some Boost libraries on Cygwin (not needed or does not compile
on this platform).
Add zlib to build dependency list for libxml2.
Add /usr/lib/lapack to PATH when using host-blas on Cygwin.
Merge pull request #251 from hashdist/johannr/boost-cygwin-fixes

Boost fixes for Cygwin
Merge pull request #250 from lanewittgen/master

Update m4 to 1.4.17.
Merge pull request #253 from hashdist/johannr/host-blas-cygwin

Add /usr/lib/lapack to PATH for host-blas on Cygwin
Merge pull request #252 from hashdist/johannr/libxml2-zlib

Add zlib to build dependency list for libxml2.
Add $ARTIFACT/bin (location of cygpetsc.dll) to PATH when building
against PETSc.
Add patch for building VTK on Cygwin.
Fix building shared lib for zlib on Cygwin.
Fix for when platform is not linux or Darwin.
Enable parallel HDF5 on Cygwin.
Merge pull request #260 from hashdist/johannr/hdf5-parallel

Enable parallel HDF5 on Cygwin
Merge pull request #259 from hashdist/johannr/bzip2-fix

Bzip2 fix for when platform is not linux or Darwin
Merge pull request #258 from hashdist/johannr/zlib-cygwin-fixes

Fix building shared lib for zlib on Cygwin
Merge pull request #257 from hashdist/johannr/vtk-cygwin-patch

Add patch for building VTK on Cygwin.
Merge pull request #256 from hashdist/johannr/petsc-cygwin

Add $ARTIFACT/bin to PATH when building against PETSc