[patch, committed] Use PRId64 in libgomp/config/linux

[Tobias Burnus]

Use PRId64 if available, otherwise use a cast. For some reasons, it 
failed during bootstrap with a -Werror even though %ld should be okay 
with int64_t on x86_64-gnu-linux. Nonetheless, using PRId64 is better.

Committed after testing on x86_64-gnu-linux.

Tobias

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