Properly handle docstring file dependency.

git-svn-id: https://svn.openturns.org/openturns/branches/rc@3951 59136d6a-6dff-0310-91ca-bfc5db6e1932
MingGW: removed useless LINKER_FLAGS

git-svn-id: https://svn.openturns.org/openturns/branches/rc@3952 59136d6a-6dff-0310-91ca-bfc5db6e1932
Let cmake find extra cxx/fortran libs instead of hardcoding them.

git-svn-id: https://svn.openturns.org/openturns/branches/rc@3953 59136d6a-6dff-0310-91ca-bfc5db6e1932
MinGW: disable TBB for now as parallel tests hang on autobuilder. distcheck ok.

git-svn-id: https://svn.openturns.org/openturns/branches/rc@3954 59136d6a-6dff-0310-91ca-bfc5db6e1932