cmMakefile: Simplify custom target 'force' output name generation
Remove unnecessary check of policy CMP0049. The policy can never trigger on our internally-generated name because it has no variable references. The rename in commit 0ed5ce4c (cmTarget: Rename AddSource method for backward compatibility., 2014-03-17, v3.1.0-rc1~688^2~17) made it look like this code path depended on CMP0049. Then commit 0e1faa28 (cmMakefile: Separate custom command setup from actual creation, 2019-09-14, v3.16.0-rc1~85^2) and commit ea1bed34 (cmMakefile: Extract utilities used for creation of custom commands, 2019-09-21, v3.16.0-rc1~52^2~1) built additional infrastructure to thread that dependence through the call stack. Remove it all.
Showing with 16 additions and 32 deletions