CMake: Search for PythonQt headers in more places.

Suggested by Denis Proskurin.

CMakeModules/FindPythonQt.cmake

@@ -24,17 +24,24 @@ string(REGEX REPLACE
 )
 
 if(NOT EXISTS "${PYTHONQT_INSTALL_DIR}")
-  find_path(PYTHONQT_INSTALL_DIR include/PythonQt/PythonQt.h DOC "Directory where PythonQt was installed.")
+    find_path(PYTHONQT_INSTALL_DIR
+        NAMES
+            include/PythonQt/PythonQt.h
+            include/PythonQt5/PythonQt.h
+        DOC "Directory where PythonQt was installed.")
 endif()
+
 # XXX Since PythonQt 3.0 is not yet cmakeified, depending
 #     on how PythonQt is built, headers will not always be
 #     installed in "include/PythonQt". That is why "src"
 #     is added as an option. See [1] for more details.
 #     [1] https://github.com/commontk/CTK/pull/538#issuecomment-86106367
 find_path(PYTHONQT_INCLUDE_DIR PythonQt.h
-  PATHS "${PYTHONQT_INSTALL_DIR}/include/PythonQt"
+    PATHS
+        "${PYTHONQT_INSTALL_DIR}/include/PythonQt"
+        "${PYTHONQT_INSTALL_DIR}/include/PythonQt5"
         "${PYTHONQT_INSTALL_DIR}/src"
-  DOC "Path to the PythonQt include directory")
+    DOC "Path to the PythonQt include directory")
 
 if ( NOT PythonQt_FIND_QUIETLY )
     message( STATUS "Searching for PythonQt (PythonLibs ${PYTHONLIBS_MAJMIN}) .." )