Do not link python modules against -lpython2.X. Since KDE4's cmake file
uses --no-undefined by default, we have to remove that from the default
CMAKE_SHARED_LINKER_FLAGS variable, but only for the pykde4 subdirectory.

Index: b/python/pykde4/CMakeLists.txt
===================================================================
--- a/python/pykde4/CMakeLists.txt
+++ b/python/pykde4/CMakeLists.txt
@@ -93,6 +93,9 @@

 ADD_DEFINITIONS(-D_REENTRANT -DQT_CORE_LIB -DQT_GUI_LIB -DUSING_SOPRANO_NRLMODEL_UNSTABLE_API)

+# Do not use --no-undefined for python modules.
+STRING(REPLACE -Wl,--no-undefined "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
+
 FILE(GLOB kdecore_files_sip sip/kdecore/*.sip)
 set(SIP_EXTRA_FILES_DEPEND ${kdecore_files_sip})
 ADD_SIP_PYTHON_MODULE(PyKDE4.kdecore sip/kdecore/kdecoremod.sip ${KDE4_KDECORE_LIBS} ${KDE4_KPTY_LIBS} ${QT_QTNETWORK_LIBRARY})