[gomp4] Mark fopenacc as LTO option

[Tom de Vries]

Thomas,

This patch marks fopenacc as LTO option.

This allows fopenacc to be passed to lto, which means the openacc builtins are 
recognized when reading in the LTO stream. This fixes a number of testcases in 
the libgomp testsuite.

ok for gomp-4_0-branch?

Thanks,
- Tom
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