[Rpm-maint] [rpm-software-management/rpm] Do not expand macro in a comment. (#123)

[MyungJoo Ham]

Some escaping characters allowing to do seems reasonable:
```
cat << EOF >> fooscript
\#!%{_bindir}/python
EOF
```
or
```
%define SHARP #
cat << EOF >> fooscript
%{sharp}!%{_bindir}/python
EOF
```

However, if people has been using what @pmatilai has said, it is appropriate not to break the old working codes.

Then, what about emitting ERRORS when we meet multiline (\n in macro) macro inside comments?
If that's fine with you, I'm willing to resubmit a commit.

E.g.,
```
%define a blah
#%a
```
does not give an error.

However,
```
%define a make \
  -DABC=abc
#%make
```
gives an error.



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