Make header guards in GeneralMatrixMatrix.h and Parallelizer.h consistent:...

Eigen/src/Core/products/GeneralMatrixMatrix.h

diff --git a/Eigen/src/Core/products/GeneralMatrixMatrix.h b/Eigen/src/Core/products/GeneralMatrixMatrix.h
index 55fa5ff..e9d0cae 100644
--- a/Eigen/src/Core/products/GeneralMatrixMatrix.h
+++ b/Eigen/src/Core/products/GeneralMatrixMatrix.h
@@ -69,7 +69,7 @@
     gemm_pack_rhs<RhsScalar, Index, RhsMapper, Traits::nr, RhsStorageOrder> pack_rhs;
     gebp_kernel<LhsScalar, RhsScalar, Index, ResMapper, Traits::mr, Traits::nr, ConjugateLhs, ConjugateRhs> gebp;
 
-#if defined(EIGEN_HAS_OPENMP) || defined(EIGEN_GEMM_THREADPOOL)
+#if !defined(EIGEN_USE_BLAS) && (defined(EIGEN_HAS_OPENMP) || defined(EIGEN_GEMM_THREADPOOL))
     if (info) {
       // this is the parallel version!
       int tid = info->logical_thread_id;