Drop unused glew build dependency

OpenGL/GLEW is used only for unit tests which are disabled by default.

eigen3.spec

@@ -22,7 +22,7 @@
 
 Name:           eigen3
 Version:        3.4.0
-Release:        11%{?dist}
+Release:        12%{?dist}
 Summary:        A lightweight C++ template library for vector and matrix math
 
 License:        MPL-2.0 AND LGPL-2.0-or-later AND BSD-3-Clause AND Minpack
@@ -33,7 +33,10 @@ Source1:        mingw_TryRunResults.cmake
 
 BuildRequires:  %{blaslib}-devel
 BuildRequires:  fftw-devel
+%if 0
+# for OpenGL in unit tests, disabled by default
 BuildRequires:  glew-devel
+%endif
 BuildRequires:  gmp-devel
 BuildRequires:  gsl-devel
 BuildRequires:  mpfr-devel
@@ -192,6 +195,9 @@ MINGW64_CMAKE_ARGS="-DINCLUDE_INSTALL_DIR=%{mingw64_includedir}/%{name} -DCMAKEP
 
 
 %changelog
+* Thu Aug 03 2023 Yaakov Selkowitz <yselkowi@redhat.com> - 3.4.0-12
+- Drop unused glew build dependency
+
 * Wed Jul 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 3.4.0-11
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild