Remove obsolete Group tag

References: https://fedoraproject.org/wiki/Changes/Remove_Group_Tag

mingw-lcms2.spec

@@ -8,7 +8,6 @@ Version:        2.9
 #Release:        0.2.%{prerelease}%{?dist}
 Release:        3%{?dist}
 Summary:        MinGW Color Management Engine
-Group:          Development/Libraries
 License:        MIT
 URL:            http://www.littlecms.com/
 #Source0:        http://www.littlecms.com/%{mingw_pkg_name}-%{version}%{prerelease}.tar.gz
@@ -42,7 +41,6 @@ parallel installed with the original (deprecated) lcms.
 
 %package -n mingw32-%{mingw_pkg_name}-static
 Summary:  Static libraries for mingw32-%{mingw_pkg_name} development
-Group:    Development/Libraries
 Requires: mingw32-%{mingw_pkg_name} = %{version}-%{release}
 
 %description -n mingw32-%{mingw_pkg_name}-static
@@ -60,7 +58,6 @@ parallel installed with the original (deprecated) lcms.
 
 %package -n mingw64-%{mingw_pkg_name}-static
 Summary:  Static libraries for mingw64-%{mingw_pkg_name} development
-Group:    Development/Libraries
 Requires: mingw64-%{mingw_pkg_name} = %{version}-%{release}
 
 %description -n mingw64-%{mingw_pkg_name}-static