external: cleaned up flextGL template files.

We don't use deprecated functionality anyway (resulted in no changes of
generated files whatsoever).

src/MagnumExternal/OpenGL/GL/flextGL.cpp.template

@@ -5,7 +5,7 @@
 extern "C" {
 #endif
 @for category,funcs in functions:
-@if len(funcs) > 0 and category not in ['VERSION_1_0', 'VERSION_1_1','VERSION_1_0_DEPRECATED', 'VERSION_1_1_DEPRECATED' ]:
+@if len(funcs) > 0 and category not in ['VERSION_1_0', 'VERSION_1_1']:
 
 /* GL_@category */
 @for f in funcs:

src/MagnumExternal/OpenGL/GL/flextGL.h.template

@@ -79,7 +79,7 @@ void flextGLInit();
 
 /* GL_@cat */
 
-    @if cat in ['VERSION_1_0', 'VERSION_1_1','VERSION_1_0_DEPRECATED', 'VERSION_1_1_DEPRECATED']:
+    @if cat in ['VERSION_1_0', 'VERSION_1_1']:
         @for f in funcs:
 GLAPI FLEXTGL_EXPORT @f.returntype APIENTRY gl@f.name\
 (@f.param_type_list_string());

src/MagnumExternal/OpenGL/GL/flextGLPlatform.cpp.template

@@ -9,7 +9,7 @@
 void flextGLInit() {
     Magnum::Platform::Implementation::OpenGLFunctionLoader loader;
     @for category,funcs in functions:
-    @if category not in ['VERSION_1_0', 'VERSION_1_1','VERSION_1_0_DEPRECATED', 'VERSION_1_1_DEPRECATED']:
+    @if category not in ['VERSION_1_0', 'VERSION_1_1']:
 
     /* GL_@category */
     @for f in funcs: