Remove obsolete Group tag

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

mingw-libxml2.spec

@@ -6,7 +6,6 @@ Release:        5%{?dist}
 Summary:        MinGW Windows libxml2 XML processing library
 
 License:        MIT
-Group:          Development/Libraries
 URL:            http://xmlsoft.org/
 Source0:        ftp://xmlsoft.org/libxml2/libxml2-%{version}.tar.gz
 
@@ -45,7 +44,6 @@ MinGW Windows libxml2 XML processing library.
 %package -n mingw32-libxml2-static
 Summary:        Static version of the MinGW Windows XML processing library
 Requires:       mingw32-libxml2 = %{version}-%{release}
-Group:          Development/Libraries
 
 %description -n mingw32-libxml2-static
 Static version of the MinGW Windows XML processing library.
@@ -61,7 +59,6 @@ MinGW Windows libxml2 XML processing library.
 %package -n mingw64-libxml2-static
 Summary:        Static version of the MinGW Windows XML processing library
 Requires:       mingw64-libxml2 = %{version}-%{release}
-Group:          Development/Libraries
 
 %description -n mingw64-libxml2-static
 Static version of the MinGW Windows XML processing library.