Merge pull request #221 from ximion/master

Make Boost.Python3 cmake script work properly on Debian again

CMakeModules/BoostPython3.cmake

@@ -40,6 +40,8 @@ macro( find_boost_python3 boost_version python_version found_var )
             break()
         endif()
     endforeach()
+
+    if (NOT ${found_var})
         # The following loop changes the searched name for Gentoo based distributions
         # turns "3.4.123abc" into "3.4"
         string( REGEX REPLACE "([0-9]+)\\.([0-9]+)\\..*" "\\1.\\2" _fbp_python_short_version ${python_version} )
@@ -51,4 +53,5 @@ macro( find_boost_python3 boost_version python_version found_var )
                 break()
             endif()
         endforeach()
+    endif()
 endmacro()