cmake: fix setting definition

- definitions should be set with COMPILE_DEFINITIONS

Change-Id: Icdd47a010fd51ff4f061ef744d9004ef6b8fca2e
Gitlab: #262, #263

CMakeLists.txt

@@ -13,8 +13,8 @@ set(CMAKE_AUTOUIC ON)
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
 set(SRC_DIR ${PROJECT_SOURCE_DIR}/src)
-set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} ${Qt5Widgets_EXECUTABLE_COMPILE_FLAGS}
-    -DJAMI_DATA_DIR='"'${CMAKE_INSTALL_PREFIX}/share/jami-qt'"')
+set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS}
+    ${Qt5Widgets_EXECUTABLE_COMPILE_FLAGS})
 
 set(QML_RESOURCES ${PROJECT_SOURCE_DIR}/resources.qrc)
 set(QML_RESOURCES_QML ${PROJECT_SOURCE_DIR}/qml.qrc)
@@ -207,6 +207,9 @@ add_executable(${PROJECT_NAME}
     ${QML_RESOURCES_QML}
     ${LRC_SRC_PATH}/webresource.qrc)
 
+target_compile_definitions(jami-qt PRIVATE
+    JAMI_DATA_DIR="${CMAKE_INSTALL_PREFIX}/share/${PROJECT_NAME}")
+
 find_library(ringclient ringclient ${LRCLIBDIR} NO_DEFAULT_PATH)
 find_library(qrencode qrencode)
 find_library(X11 X11)