Miscellaneous cleanups, fixes to recent commits.

Details:
- Fixed a typo in bli_l1f_ref.h, introduced into bbb8569, that only
  manifested when non-reference level-1f kernels were used.
- Added an #undef BLIS_SIMD_ALIGN_SIZE to bli_kernel.h of dunnington
  configuration to prevent a compile-time warning until I can figure out
  the proper permanent fix.
- Moved frame/1f/kernels/bli_dotxaxpyf_ref_var1.c out of the compilation
  path (into 'other' directory). _ref_var2 is used by default, which is
  the variant that is built on axpyf and dotxf instead of dotaxpyv.
- Removed section of frame/include/bli_config_macro_defs.h pertaining to
  mixed datatype support.

frame/1f/kernels/bli_l1f_ref.h

@@ -35,21 +35,21 @@
 // Redefine level-1f kernel API names to induce prototypes.
 
 #undef  axpy2v_ker_name
-#define axpy2v_ker_name    axpy2v_ref
+#define axpy2v_ker_name     axpy2v_ref
 
 #undef  dotaxpyv_ker_name
-#define dotaxpyv_ker_name  dotaxpyv_ref
+#define dotaxpyv_ker_name   dotaxpyv_ref
 
 #undef  axpyf_ker_name
-#define axpyf_ker_name     axpyf_ref
+#define axpyf_ker_name      axpyf_ref
 
 #undef  dotxf_ker_name
-#define dotxf_ker_name     dotxf_ref
+#define dotxf_ker_name      dotxf_ref
 
-#undef  dotxaxpy_ker_name
-#define dotxaxpy_ker_name  dotxaxpyf_ref
+#undef  dotxaxpyf_ker_name
+#define dotxaxpyf_ker_name  dotxaxpyf_ref_var2
 
 // Include the level-1f kernel API template.
 
-#include "bli_l1v_ker.h"
+#include "bli_l1f_ker.h"