Link to Eigen BLAS for non-gemm drivers in test/3.

Details:
- Adjusted test/3/Makefile so that the test drivers are linked against
  Eigen's BLAS library for hemm, herk, trmm, and trsm. We have to do
  this since Eigen's headers don't define implementations to the
  standard BLAS APIs.
- Simplified #included headers in hemm, herk, trmm, and trsm source
  driver files, since nothing specific to Eigen is needed at
  compile-time for those operations.

test/3/Makefile

@@ -358,6 +358,7 @@ get-bl-cpp = $(strip \
                                               $(STR_VEN) $(BLA_DEF))))))
 
 
+
 # Rules for BLIS and BLAS libraries.
 define make-st-rule
 test_$(1)$(2)_$(PS_MAX)_$(3)_st.o: test_$(op).c Makefile
@@ -443,13 +444,13 @@ test_%_$(P2_MAX)_openblas_2s.x: test_%_$(P2_MAX)_openblas_2s.o $(LIBBLIS_LINK)
 
 
 test_%_$(PS_MAX)_eigen_st.x:    test_%_$(PS_MAX)_eigen_st.o    $(LIBBLIS_LINK)
-	$(CXX) $(strip $<                   $(LIBBLIS_LINK) $(LDFLAGS) -o $@)
+	$(CXX) $(strip $<  $(EIGEN_LIB)     $(LIBBLIS_LINK) $(LDFLAGS) -o $@)
 
 test_%_$(P1_MAX)_eigen_1s.x:    test_%_$(P1_MAX)_eigen_1s.o    $(LIBBLIS_LINK)
-	$(CXX) $(strip $<                   $(LIBBLIS_LINK) $(LDFLAGS) -o $@)
+	$(CXX) $(strip $<  $(EIGENP_LIB)    $(LIBBLIS_LINK) $(LDFLAGS) -o $@)
 
 test_%_$(P2_MAX)_eigen_2s.x:    test_%_$(P2_MAX)_eigen_2s.o    $(LIBBLIS_LINK)
-	$(CXX) $(strip $<                   $(LIBBLIS_LINK) $(LDFLAGS) -o $@)
+	$(CXX) $(strip $<  $(EIGENP_LIB)    $(LIBBLIS_LINK) $(LDFLAGS) -o $@)
 
 
 test_%_$(PS_MAX)_vendor_st.x:   test_%_$(PS_MAX)_vendor_st.o   $(LIBBLIS_LINK)

test/3/test_hemm.c

@@ -33,15 +33,7 @@
 */
 
 #include <unistd.h>
-#ifdef EIGEN
-  #define BLIS_DISABLE_BLAS_DEFS
-  #include "blis.h"
-  #include <Eigen/Core>
-  #include <Eigen/src/misc/blas.h>
-  using namespace Eigen;
-#else
-  #include "blis.h"
-#endif
+#include "blis.h"
 
 //#define PRINT