Z:englobe-dpkg-man--d47cb0-Number of jobs allowed to be r/hu

Number of jobs allowed to be run simultaneously, equivalent to the B (1) option of the same name. Will add itself to the MAKEFLAGS environment variable, which should cause all subsequent make invocations to inherit the option. Also adds B I to the DEB_BUILD_OPTIONS environment variable which allows debian/rules files to use this information for their own purposes. If no B<-j> option is given, an existing value for B will be honoured and added to MAKEFLAGS.