Fix VYMBASEDIR (https://github.com/insilmaril/vym/issues/14)

--- CMakeLists.txt
+++ CMakeLists.txt
@@ -200,7 +200,7 @@ IF(NOT DATADIR)
     SET(DATADIR "${CMAKE_INSTALL_PREFIX}")
 ENDIF()
 
-ADD_COMPILE_DEFINITIONS(VYMBASEDIR="${DATADIR}")
+ADD_COMPILE_DEFINITIONS(VYMBASEDIR="${DATADIR}/vym")
 
 ADD_EXECUTABLE(vym ${VymSources} vym.qrc ${VymTranslations})
 TARGET_LINK_LIBRARIES(vym ${QtLibraries})
--- vym.pro
+++ vym.pro
@@ -322,7 +322,7 @@ message( "Data directory (DATADIR): $$DATADIR" )
 target.path = $${BINDIR}
 INSTALLS += target
 
-DEFINES += "VYMBASEDIR='\"$${DATADIR}\"'"
+DEFINES += "VYMBASEDIR='\"$${DATADIR}/vym\"'"
 
 language.files = lang/*.qm
 language.path = $${DATADIR}/vym/lang