Build: require OpenJPEG 2.x minimum, remove bundled version.

* WITH_SYSTEM_OPENJPEG is removed and is now always on, this was already
  the case for macOS and Windows.
* This should not break existing Linx builds. If there is no new enough
  OpenJPEG installed, CMake will no find libopenjp2 and WITH_IMAGE_OPENJPEG
  will be disabled.
* install_deps.sh was updated with new package names, since distributions
  put this version in a new package.

Differential Revision: https://developer.blender.org/D3663

CMakeLists.txt

@@ -167,7 +167,6 @@ option_defaults_init(
 	_init_FFTW3
 	_init_GAMEENGINE
 	_init_OPENSUBDIV
-	_init_SYSTEM_OPENJPG
 )
 
 # customize...
@@ -184,13 +183,11 @@ if(UNIX AND NOT APPLE)
 	set(_init_SDL                            OFF)
 	set(_init_FFTW3                          OFF)
 	set(_init_OPENSUBDIV                     OFF)
-	set(_init_SYSTEM_OPENJPG                 OFF)
 elseif(WIN32)
 	set(_init_JACK                           OFF)
 elseif(APPLE)
 	set(_init_JACK                           OFF)
 	set(_init_OPENSUBDIV                     OFF)
-	set(_init_SYSTEM_OPENJPG                 OFF)
 endif()
 
 
@@ -304,9 +301,6 @@ else()
 endif()
 
 
-# (unix defaults to System OpenJPEG On)
-option(WITH_SYSTEM_OPENJPEG "Use the operating systems OpenJPEG library" ${_init_SYSTEM_OPENJPG})
-
 if(UNIX AND NOT APPLE)
 	option(WITH_SYSTEM_EIGEN3 "Use the systems Eigen3 library" OFF)
 endif()
@@ -1019,16 +1013,11 @@ else()
 	unset(_SYSTEM_BIG_ENDIAN)
 endif()
 if(WITH_IMAGE_OPENJPEG)
-	if(WITH_SYSTEM_OPENJPEG)
-		# dealt with above
-		set(OPENJPEG_DEFINES "")
-	else()
-		set(OPENJPEG_INCLUDE_DIRS "${CMAKE_SOURCE_DIR}/extern/libopenjpeg")
-		set(OPENJPEG_DEFINES "-DOPJ_STATIC")
-	endif()
 	# Special handling of Windows platform where openjpeg is always static.
 	if(WIN32)
 		set(OPENJPEG_DEFINES "-DOPJ_STATIC")
+	else()
+		set(OPENJPEG_DEFINES "")
 	endif()
 endif()
 
@@ -1751,7 +1740,6 @@ if(FIRST_RUN)
 	info_cfg_option(WITH_MEM_JEMALLOC)
 	info_cfg_option(WITH_MEM_VALGRIND)
 	info_cfg_option(WITH_SYSTEM_GLEW)
-	info_cfg_option(WITH_SYSTEM_OPENJPEG)
 
 	info_cfg_text("Image Formats:")
 	info_cfg_option(WITH_OPENIMAGEIO)