devel/intel-graphics-compiler: unbreak on DragonFly

In file included from IGC/Compiler/GenUpdateCB.cpp:46:
IGC/../3d/common/iStdLib/MemCopy.h:103:25: error: expected initializer before 'FastBlockCopyFromUSWC_SSE4_1_movntdqa_movdqa'
inline void __fastcall FastBlockCopyFromUSWC_SSE4_1_movntdqa_movdqa(void* dst, const void* src );

^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

IGC/../3d/common/iStdLib/MemCopy.h:104:25: error: expected initializer before 'FastBlockCopyFromUSWC_SSE4_1_movntdqa_movdqu'
inline void __fastcall FastBlockCopyFromUSWC_SSE4_1_movntdqa_movdqu(void* dst, const void* src );

^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Reported by: DPorts