Allow build/doc/version.sgml to be created on build even if the build/doc/ subdirectory doesn't exist.
Allow build/doc/version.sgml to be created on build even if the build/doc/ subdirectory doesn't exist.

Distrotech/scons,timj/scons,Distrotech/scons,andrewyoung1991/scons,timj/scons,andrewyoung1991/scons,timj/scons,timj/scons,Distrotech/scons,timj/scons,andrewyoung1991/scons,andrewyoung1991/scons,andrewyoung1991/scons,Distrotech/scons,Distrotech/scons,timj/scons,timj/scons,andrewyoung1991/scons,andrewyoung1991/scons,andrewyoung1991/scons,andrewyoung1991/scons,timj/scons,timj/scons