Increase version number on trunk to 4.0
Do further optimization for math-inlines to avoid for long double types unnecessary load/store via x87 instructions.


git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6304 4407c894-4637-0410-b4f5-ada5f102cad1
Implement isnanl and signbitl without x87 instructions


git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6305 4407c894-4637-0410-b4f5-ada5f102cad1