Fix BLAS, BLAS-like functions and Generic RISC-V kernels

* Fixed gemmt, imatcopy, zimatcopy_cnc functions
* Fixed cblas_cscal testing in ctest
* Removed rotmg unreacheble code
* Added zero size checks

kernel/generic/zimatcopy_cnc.c

@@ -40,7 +40,6 @@ int CNAME(BLASLONG rows, BLASLONG cols, FLOAT alpha_r, FLOAT alpha_i, FLOAT *a,
 
 	if ( rows <= 0     )  return(0);
 	if ( cols <= 0     )  return(0);
-    if ( alpha_r == 1.0 && alpha_i == 0.0 ) return (0); 
 
 	aptr = a;
 	lda *= 2;