Properly include xran_common.h in ${xran_INCLUDE_DIRS}

- ${xran_LOCATION}/src/xran_common.h
  - delete unnecessary target_include_directories() from FHI72

cmake_targets/tools/MODULES/Findxran.cmake

@@ -75,7 +75,6 @@ endif()
 
 find_path(xran_INCLUDE_DIR
   NAMES
-    xran_common.h
     xran_compression.h
     xran_cp_api.h
     xran_ecpri_owd_measurements.h
@@ -84,7 +83,7 @@ find_path(xran_INCLUDE_DIR
     xran_pkt_up.h
     xran_sync_api.h
   HINTS ${xran_LOCATION}
-  PATH_SUFFIXES api include
+  PATH_SUFFIXES api
   NO_DEFAULT_PATH
 )
 find_library(xran_LIBRARY
@@ -127,16 +126,19 @@ find_package_handle_standard_args(xran
   VERSION_VAR xran_VERSION
 )
 
+# in proper usage of cmake, include directory should only contain "api", but not header files under "src" directory;
+# however, we use xran_dev_get_ctx() and xran_dev_get_ctx_by_id() functions which are defined in xran_common.h;
+# since xran_common.h is under "src" directory, we have to include it in ${xran_INCLUDE_DIRS}
 if(xran_FOUND)
   set(xran_LIBRARIES ${xran_LIBRARY})
-  set(xran_INCLUDE_DIRS ${xran_INCLUDE_DIR})
+  set(xran_INCLUDE_DIRS ${xran_INCLUDE_DIR} ${xran_INCLUDE_DIR}/../src)
 endif()
 
 if(xran_FOUND AND NOT TARGET xran::xran)
   add_library(xran::xran UNKNOWN IMPORTED)
   set_target_properties(xran::xran PROPERTIES
     IMPORTED_LOCATION "${xran_LIBRARY}"
-    INTERFACE_INCLUDE_DIRECTORIES "${xran_INCLUDE_DIR}"
+    INTERFACE_INCLUDE_DIRECTORIES "${xran_INCLUDE_DIRS}"
   )
 endif()