LibHeinz include_dir -> singular

cmake/BornAgain/Dependences.cmake

@@ -5,7 +5,7 @@ if(WIN32)
 endif()
 
 find_package(LibHeinz REQUIRED)
-message(STATUS "LibHeinz: found=${LibHeinz_FOUND}, include_dirs=${LibHeinz_INCLUDE_DIRS}, "
+message(STATUS "LibHeinz: found=${LibHeinz_FOUND}, include_dirs=${LibHeinz_INCLUDE_DIR}, "
     "version=${LibHeinz_VERSION}")
 
 find_package(Threads REQUIRED)

cmake/BornAgain/SwigLib.cmake

@@ -36,7 +36,7 @@ function(SwigLib name lib tmpdir)
         #     Dispensable warnings are disabled in Wrap/Swig/warnings.i.
         #     Joachim, oct20.
         set(SWIG_FLAGS "-c++;-python;-Werror;-o;${AUTO_DIR}/lib${lib}_wrap.cpp;-outdir;${tmpdir}"
-            ";-I${LibHeinz_INCLUDE_DIRS}"
+            ";-I${LibHeinz_INCLUDE_DIR}"
             ";-I${CMAKE_SOURCE_DIR};-I${CMAKE_BINARY_DIR}/inc")
 
         add_custom_command(