[Rpm-maint] [rpm-software-management/rpm] Indentation support for tags (Issue #2927)

[Root-Core]

**Describe the bug**

I try to implement a cross distribution spec file and the dependency names differ.
So I added an if and it works fine, until I indent the line in the if.

**To Reproduce**

1. Store the spec file in `/tmp/test.spec`
2. run `rpm --specfile /tmp/test.spec`

```
Name:       demo
Version:    1.0.0
Release:    0
Summary:    RPM package
License:    GPL
BuildArch:  noarch

%if 0%{?suse_version}
  Requires: xdotool
%else
  Requires: libxdo
%endif

%description
This is a test.

%install
%__install -m 755 mybinary -Dt %{buildroot}%{_bindir}/

%files
%{_bindir}/mybinary
```

**Expected behavior**

It should be fine and output `demo-1.0.0-0.noarch`.

**Output**

```
error: line 11: Unknown tag:   Requires: libxdo
error: query of specfile /tmp/test.spec failed, can't parse
```

**Environment**

 - OS / Distribution: tested on Alma and openSUSE
 - Version 4.16.1.3 / 4.14.3

**Additional context**

I am a total rpm newbie and this might be the desired behavior.
I know that the spec file "expands" / is evaluated to something with an randomly indented line, but it looks way better in the spec file.

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