[gfortran,patch] PR libfortran/22436

[FX Coudert]

Attached easy patch fixes bug 22436: default format for real(10) and 
real(16) can lead to asterisks, in cases such as:

   print *, tiny(0.0_10)
   print *, huge(0.0_10)

The proposed patch uses format 1PG24.15E4 for REAL(10) and 1PG40.31E4 
for REAL(16). The formats for other kinds are unchanged: 1PG14.7E2 for 
REAL(4) and 1PG23.15E3 for REAL(8).

I'm leaving again tomorrow so I won't have time to commit this. So, if 
nobody objects to this choice of formats, please feel free to commit!

FX
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