[Patch, libgfortran] PR 40330 Fix use of saved format strings

[Janne Blomqvist]

Hi,

the attached patch fixes PR 40330. The problem was that for the saved
format strings we were just keeping pointer to the strings that reside
in the st_parameter_dt structure. However, this lives on the stack so
once it goes out of scope the cached entries became invalid. Fixed by
using heap storage.

Regtested on x86_64-unknown-linux-gnu, Ok for trunk and 4.4?

-- 
Janne Blomqvist
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