dbSta: fix eigen include path not being added to CXX_INCLUDES

Signed-off-by: Igor Sokolov <disk.destroyer@yahoo.com>

Author: Igor Sokolov

src/dbSta/src/CMakeLists.txt

@@ -3,6 +3,8 @@
 
 include("openroad")
 
+find_package(Eigen3 3.4 REQUIRED NO_MODULE)
+
 add_library(dbSta_lib
   dbSta.cc
   dbNetwork.cc
@@ -82,6 +84,7 @@ target_include_directories(dbSta
 
 target_link_libraries(dbSta
   PRIVATE
+    Eigen3::Eigen
     OpenSTA
     odb
     utl_lib