[Patch, Fortran] PR58226 - Avoid invalid mem access with compiler_options

[Tobias Burnus]

A rather obvious fix; the memory is freed by the caller 
(gfc_simplify_compiler_options). It is unlikely that the compiler has no 
arguments as the driver tends to send some, e.g. "-mtune=generic 
-march=x86-64" on my system. However, it is better to be safe than sorry.

Build and regtested on x86-64-gnu-linux.
OK?

Tobias
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