[xc7] target_include_directories for gui_xc7 target too

xc7/family.cmake

diff --git a/xc7/family.cmake b/xc7/family.cmake
index 673a3f0..12bb3cf 100644
--- a/xc7/family.cmake
+++ b/xc7/family.cmake
@@ -28,6 +28,9 @@
 if (BUILD_TESTS)
     target_include_directories(nextpnr-${family}-test PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/torc/src)
 endif()
+if (BUILD_GUI)
+    target_include_directories(gui_${family} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/torc/src)
+endif()
 
 set(TORC_OBJS
     ${CMAKE_CURRENT_SOURCE_DIR}/torc/src/torc/architecture/Arc.o