Remove -static from pthreads on Windows, since it doesn't work.
Remove -static from pthreads on Windows, since it doesn't work.

wbhart/flint2,dsroche/flint2,dsroche/flint2,jpflori/flint2,fredrik-johansson/flint2,dsroche/flint2,jpflori/flint2,jpflori/flint2,dsroche/flint2,jpflori/flint2,fredrik-johansson/flint2,wbhart/flint2,fredrik-johansson/flint2,wbhart/flint2