Fix detection of sip4-tqt module

build.py

@@ -35,7 +35,7 @@ import string
 
 # Get the SIP configuration.
 try:
-    import sipconfig
+    from sip4_tqt import sipconfig
 except:
     print "Unable to import the sipconfig module.  Please make sure you have"
     print "SIP v3.9 or later installed."

configure.py

@@ -28,7 +28,7 @@ import getopt
 import shutil
 import py_compile
 
-import sipconfig
+from sip4_tqt import sipconfig
 
 src_dir = os.path.dirname(os.path.abspath(__file__))
 

pyqtconfig.py.in

@@ -21,7 +21,7 @@
 # modules that %Import PyTQt modules.
 
 
-import sipconfig
+from sip4_tqt import sipconfig
 
 
 # These are installation specific values created when PyTQt was configured.