MR #87 broke simd option

the new code in MR #87 (closed) #ifdef TARGET_SIMD_X86 #define ENABLE_SIMD_OPT SIMD_ENABLE ///< SIMD optimizations, no impact on RD performance #else #define ENABLE_SIMD_OPT 0 ///< SIMD optimizations, no impact on RD performance #endif

broke the SIMD option because TARGET_SIMD_X86 is not defined (commondef should include typedef first but the macro TARGET_SIMD_X86 is defined later)