[openmp] Remove extra ';' outside of function

Fixes:
```
[4038/11058] Building CXX object projects/openmp/libomptarget/src/CMakeFiles/omptarget.dir/OpenMP/InteropAPI.cpp.o
/home/aganea/llvm-project/openmp/libomptarget/src/OpenMP/InteropAPI.cpp:202:2: warning: extra ';' outside of a function is incompatible with C++98 [-Wc++98-compat-extra-semi]
};
 ^
1 warning generated.
```