Description of problem:
%define directives in RPM spec file comment lines are interpreted.
This contradicts the documentation, which specifies that 
"Any text following the comment character will be ignored by RPM."

Version-Release number of selected component (if applicable):
rpm-4.0.4-7x.20

Spec file:
	%define foo xxx
	#%define foo yyy
	%prep
	echo %{foo}

Steps to Reproduce:
1. Create sample spec file
2. Run rpm -bp

    
Actual results:
yyy


Expected results:
xxx