Don't set group tags

They are unused in Fedora.

mingw-winpthreads.spec

@@ -14,12 +14,11 @@ Name:           mingw-winpthreads
 Version:        5.0.0
 Release:        1%{?dist}
 Summary:        MinGW pthread library
+
 # The main license of winpthreads is MIT, but parts of this library
 # are derived from the "Posix Threads library for Microsoft Windows"
 # http://locklessinc.com/articles/pthreads_on_windows/
 License:        MIT and BSD
-Group:          Development/Libraries
-
 URL:            http://mingw-w64.sourceforge.net/
 %if 0%{?snapshot_date}
 # To regenerate a snapshot:
@@ -32,7 +31,6 @@ Source0:        http://sourceforge.net/code-snapshots/git/m/mi/mingw-w64/mingw-w
 Source0:        http://downloads.sourceforge.net/mingw-w64/mingw-w64-v%{version}%{?pre:-%{pre}}.tar.bz2
 %endif
 
-
 BuildArch:      noarch
 
 BuildRequires:  mingw32-filesystem >= 95
@@ -211,6 +209,7 @@ find $RPM_BUILD_ROOT -name "*.la" -delete
 %changelog
 * Wed Oct 26 2016 Kalev Lember <klember@redhat.com> - 5.0.0-1
 - Update to 5.0.0
+- Don't set group tags
 
 * Sun Mar 27 2016 Erik van Pienbroek <epienbro@fedoraproject.org> - 5.0-0.1.rc2
 - Update to 5.0-rc2