cmGlobalGenerator: FindMakeProgram() at a generator-specific time
!4898 (merged) moved FindMakeProgram() to an earlier time, which resulted in CMAKE_MAKE_PROGRAM not being read from the toolchain file. Change it to only call FindMakeProgram() early in the specific cases of Visual Studio and Xcode, and restore the old behavior for all other generators.
Fixes: #21486 (closed)
Backport: release