opengl: reorder Makefile

Gather all libgl_plugin.la declarations at the same place.

modules/video_output/opengl/Makefile.am

@@ -70,6 +70,9 @@ libgl_plugin_la_SOURCES = video_output/opengl/display.c \
     $(OPENGL_VOUT_COMMONSOURCES)
 libgl_plugin_la_CFLAGS = $(AM_CFLAGS) $(GL_CFLAGS) $(OPENGL_COMMONCFLAGS)
 libgl_plugin_la_LIBADD = libvlc_opengl.la
+if HAVE_GL
+vout_LTLIBRARIES += libgl_plugin.la
+endif # HAVE_GL
 
 libglfilter_mock_plugin_la_SOURCES = video_output/opengl/filter_mock.c
 libglfilter_mock_plugin_la_LIBADD = $(LIBM)
@@ -91,10 +94,6 @@ libglfilter_mock_plugin_la_CFLAGS = -DUSE_OPENGL_ES2=1
 noinst_LTLIBRARIES += libglfilter_mock_plugin.la
 endif
 
-if HAVE_GL
-vout_LTLIBRARIES += libgl_plugin.la
-endif # HAVE_GL
-
 libegl_display_generic_plugin_la_SOURCES = video_output/opengl/egl_display_generic.c
 libegl_display_generic_plugin_la_CPPFLAGS = $(AM_CPPFLAGS) $(EGL_FLAGS)
 libegl_display_generic_plugin_la_LIBADD = $(EGL_LIBS)