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Replace the members for the Makefile and the Error with a
cmExecutionStatus.  Re-implement GetMakefile and SetError based on that.

Both functions should be called directly on the cmExecutionStatus that is
passed to InitialPass.  This will help us make all Commands immutable and
remove the need for cloning.

The setters are only used to set boolean values.  The values are never
reset individually.

Use getter function to access the Makefile.

Instead, prefix the error message at the two places where the errors are
handled: cmMakefile and cmCTestHandlerCommand.

The Helper member is used in a single derived class only.
Remove it from the base class to the only place where it is used.

Brad King authored Jan 13, 2017 and Kitware Robot committed Jan 13, 2017

4ae2dcb1 CheckFunctionExists: Document suggestion to use CheckSymbolExists instead.