[gfortran,patch] Make MIN and MAX handle NaNs correctly (PR32048)

[FX Coudert]

> The testsuite now hangs in nan_1.f90 on Cygwin_NT/amd_64.  I have  
> never seen this happen before - it does not even time out!  It  
> hangs in compilation - if you have any thoughts on how this might  
> be happening, let me know and I'll take a look-see.

Yuck :(

No idea right now, and I don't have cygwin fully setup yet; if you  
run f951 under gdb, and manually break, where is it stuck?

FX