Comment # 1 on bug 4256 from Vasiliy Glazov

1. Remove
%global         gituser         Aegisub
%global         gitname         Aegisub
And use %{url instead of https://github.com/%{gituser}/%{gitname} in Source0.

2. Change
%autosetup -n %{gitname}-%{version} -p 1
to
%autosetup -n Aegisub-%{version} -p 1

It is not so often used to make %global macro.

3. Remove rm -rf %{buildroot}.

4. Make desktop-file validation.