Applies @mgates3 patch to fix BLAS++ and LAPACK++ installation

Reference-LAPACK#903 (review)

Author: weslleyspereira

CMakeLists.txt

@@ -633,21 +633,19 @@ install(FILES
 
 if (LAPACK++)
   install(
-    DIRECTORY "${LAPACK_BINARY_DIR}/lib/"
+    DIRECTORY "${LAPACK_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR}/"
     DESTINATION ${CMAKE_INSTALL_LIBDIR}
     FILES_MATCHING REGEX "lapackpp"
   )
 endif()
 
-if (BLAS++)
+if (BLAS++ OR LAPACK++)
   install(
-    DIRECTORY "${LAPACK_BINARY_DIR}/lib/"
+    DIRECTORY "${LAPACK_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR}/"
     DESTINATION ${CMAKE_INSTALL_LIBDIR}
     FILES_MATCHING REGEX "blaspp"
   )
-endif()
 
-if (BLAS++ OR LAPACK++)
   install(
     DIRECTORY "${LAPACK_BINARY_DIR}/include/"
     DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"