package: don't build GlutApplication in Debian and Gentoo packages.

ArchLinux AUR PKGBUILD is fixed already.

package/debian/control

@@ -11,14 +11,14 @@ Vcs-Browser: https://github.com/mosra/magnum
 Package: magnum-dev
 Section: libdevel
 Architecture: any
-Depends: magnum (= ${binary:Version}), corrade-dev, libgl-dev, freeglut3-dev, libopenal-dev, libsdl2-dev
+Depends: magnum (= ${binary:Version}), corrade-dev, libgl-dev, libopenal-dev, libsdl2-dev
 Description: Magnum development files
  Headers and tools needed for developing with Magnum.
 
 Package: magnum
 Section: libs
 Architecture: any
-Depends: ${shlibs:Depends}, ${misc:Depends}, corrade, libgl1, freeglut3, libopenal1, libsdl2
+Depends: ${shlibs:Depends}, ${misc:Depends}, corrade, libgl1, libopenal1, libsdl2
 Description: C++11/C++14 and OpenGL 2D/3D graphics engine
  Magnum is 2D/3D graphics engine written in C++11 and modern OpenGL. Its goal
  is to simplify low-level graphics development and interaction with OpenGL

package/debian/rules

@@ -6,7 +6,6 @@
 override_dh_auto_configure:
 	dh_auto_configure -- \
 		-DWITH_AUDIO=ON \
-		-DWITH_GLUTAPPLICATION=ON \
 		-DWITH_GLXAPPLICATION=ON \
 		-DWITH_SDL2APPLICATION=ON \
 		-DWITH_WINDOWLESSGLXAPPLICATION=ON \

package/gentoo/dev-libs/magnum/magnum-9999.ebuild

@@ -19,7 +19,6 @@ IUSE=""
 RDEPEND="
 	dev-libs/corrade
 	media-libs/openal
-	media-libs/freeglut
 	media-libs/libsdl2
 "
 DEPEND="${RDEPEND}"
@@ -29,7 +28,6 @@ src_configure() {
 		-DCMAKE_INSTALL_PREFIX="${EPREFIX}/usr"
 		-DCMAKE_BUILD_TYPE=Release
 		-DWITH_AUDIO=ON
-		-DWITH_GLUTAPPLICATION=ON
 		-DWITH_GLXAPPLICATION=ON
 		-DWITH_SDL2APPLICATION=ON
 		-DWITH_WINDOWLESSGLXAPPLICATION=ON