[LyX/master] Fix compilation with cmake

[Enrico Forestieri]

commit 6d3019c7de54e0a6f36405df694cf4c311574d5c
Author: Enrico Forestieri <for...@lyx.org>
Date:   Thu Mar 26 02:27:11 2015 +0100

    Fix compilation with cmake

diff --git a/src/insets/CMakeLists.txt b/src/insets/CMakeLists.txt
index 48a95cf..0a8c04c 100644
--- a/src/insets/CMakeLists.txt
+++ b/src/insets/CMakeLists.txt
@@ -24,6 +24,8 @@ else()
 endif()
 set_target_properties(insets PROPERTIES FOLDER "applications/LyX")
 
+qt_use_modules(insets Gui)
+
 lyx_add_gcc_pch(insets)
 
 project_source_group("${GROUP_CODE}" insets_sources insets_headers)