Force core profile as main profile

This removes a few options from CMake:
* WITH_LEGACY_OPENGL
* WITH_GL_PROFILE_COMPAT
* WITH_GL_PROFILE_CORE

We still have WITH_GL_PROFILE_ES20. So you can still alternate between
ES20 and CORE profile (when es20 is disabled).

If you want to explicitly see the stubs errors just define
WITH_LEGACY_OPENGL.

CMakeLists.txt

@@ -244,8 +244,6 @@ option(WITH_OPENCOLORIO   "Enable OpenColorIO color management" ${_init_OPENCOLO
 
 option(WITH_CLAY_ENGINE    "Enable New Clay engine (Breaks Mac and Mesa compatibility)" ON)
 
-option(WITH_LEGACY_OPENGL  "Enable build of legacy OpenGL" ON)
-
 # Compositor
 option(WITH_COMPOSITOR         "Enable the tile based nodal compositor" ON)
 
@@ -468,15 +466,11 @@ endif()
 
 option(WITH_GLEW_ES             "Switches to experimental copy of GLEW that has support for OpenGL ES. (temporary option for development purposes)" OFF)
 option(WITH_GL_EGL              "Use the EGL OpenGL system library instead of the platform specific OpenGL system library (CGL, glX, or WGL)"       OFF)
-option(WITH_GL_PROFILE_COMPAT   "Support using the OpenGL 'compatibility' profile. (deprecated)"                                                    ON )
-option(WITH_GL_PROFILE_CORE     "Support using the OpenGL 3.3+ 'core' profile."                                                                     OFF)
 option(WITH_GL_PROFILE_ES20     "Support using OpenGL ES 2.0. (thru either EGL or the AGL/WGL/XGL 'es20' profile)"                                  OFF)
 
 mark_as_advanced(
 	WITH_GLEW_ES
 	WITH_GL_EGL
-	WITH_GL_PROFILE_COMPAT
-	WITH_GL_PROFILE_CORE
 	WITH_GL_PROFILE_ES20
 )
 
@@ -960,10 +954,7 @@ if(WITH_SYSTEM_GLES)
 	find_package_wrapper(OpenGLES)
 endif()
 
-if(WITH_GL_PROFILE_COMPAT OR WITH_GL_PROFILE_CORE)
+if(WITH_GL_PROFILE_ES20)
-	list(APPEND BLENDER_GL_LIBRARIES "${OPENGL_gl_LIBRARY}")
-
-elseif(WITH_GL_PROFILE_ES20)
 	if(WITH_SYSTEM_GLES)
 		if(NOT OPENGLES_LIBRARY)
 			message(FATAL_ERROR
@@ -1023,6 +1014,9 @@ elseif(WITH_GL_PROFILE_ES20)
 
 	endif()
 
+else()
+	list(APPEND BLENDER_GL_LIBRARIES "${OPENGL_gl_LIBRARY}")
+
 endif()
 
 if(WITH_GL_EGL)
@@ -1070,20 +1064,10 @@ if(WITH_GL_EGL)
 
 endif()
 
-if(WITH_LEGACY_OPENGL)
-	list(APPEND GL_DEFINITIONS -DWITH_LEGACY_OPENGL)
-endif()
-
-if(WITH_GL_PROFILE_COMPAT)
-	list(APPEND GL_DEFINITIONS -DWITH_GL_PROFILE_COMPAT)
-endif()
-
-if(WITH_GL_PROFILE_CORE)
-	list(APPEND GL_DEFINITIONS -DWITH_GL_PROFILE_CORE)
-endif()
-
 if(WITH_GL_PROFILE_ES20)
 	list(APPEND GL_DEFINITIONS -DWITH_GL_PROFILE_ES20)
+else()
+	list(APPEND GL_DEFINITIONS -DWITH_GL_PROFILE_CORE)
 endif()
 
 if(WITH_GL_EGL)
@@ -1137,12 +1121,11 @@ else()
 		list(APPEND GL_DEFINITIONS -DGLEW_STATIC -DWITH_GLEW_ES)
 
 		# These definitions remove APIs from glew.h, making GLEW smaller, and catching unguarded API usage
-		if(NOT WITH_GL_PROFILE_ES20)
+		if(WITH_GL_PROFILE_ES20)
+			list(APPEND GL_DEFINITIONS -DGLEW_ES_ONLY)
+		else()
 			# No ES functions are needed
 			list(APPEND GL_DEFINITIONS -DGLEW_NO_ES)
-		elseif(NOT (WITH_GL_PROFILE_CORE OR WITH_GL_PROFILE_COMPAT))
-			# ES is enabled, but the other functions are all disabled
-			list(APPEND GL_DEFINITIONS -DGLEW_ES_ONLY)
 		endif()
 
 		if(WITH_GL_PROFILE_ES20)
@@ -1715,8 +1698,6 @@ if(FIRST_RUN)
 	info_cfg_text("OpenGL:")
 	info_cfg_option(WITH_GLEW_ES)
 	info_cfg_option(WITH_GL_EGL)
-	info_cfg_option(WITH_GL_PROFILE_COMPAT)
-	info_cfg_option(WITH_GL_PROFILE_CORE)
 	info_cfg_option(WITH_GL_PROFILE_ES20)
 	if(WIN32)
 		info_cfg_option(WITH_GL_ANGLE)