Build pyqwt with qwt5

--- PyQwt-5.2.0.orig/configure/configure.py 2009-08-01 09:28:33.000000000 +0200
+++ PyQwt-5.2.0/configure/configure.py  2011-07-25 16:26:43.000000000 +0200
@@ -742,7 +742,7 @@
     if sys.platform == 'win32':
         qwt = 'qwt5'
     else:
-        qwt = 'qwt'
+        qwt = 'qwt5'
     if options.qwt_sources:
         # yes, zap all occurrences of a qwt library
         while options.extra_libs.count(qwt):