This fixes an undefined symbol of llvm::Triple::Triple() constructor when building the NextGen plugins:
openmp/libomptarget/plugins-nextgen/common/PluginInterface/JIT.cpp:343: undefined reference to `llvm::Triple::Triple(llvm::Twine const&)'
Although the patch makes the error to disappear on my side, I'm opening this review since I'm not 100% sure whether this is a complete fix.