Metal setup merge (#1616)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: Alex Cristici <alex.cristici@gmail.com>
Co-authored-by: mwilsnd <mwilsnd@gmail.com>
Co-authored-by: Stefan Karschti <stefan.karschti@gmail.com>
Co-authored-by: Bart Louwers <bart@emeel.net>
Co-authored-by: Alex Cristici <alex@skoon.energy>
Co-authored-by: Bart Louwers <bart.louwers@gmail.com>
Co-authored-by: Wei Chen <alanchenboy@gmail.com>
Co-authored-by: Siarhei Fedartsou <siarhei.fedartsou@gmail.com>
Co-authored-by: tdcosta100 <tdcosta100@gmail.com>

bin/CMakeLists.txt

@@ -56,3 +56,7 @@ install(TARGETS mbgl-offline mbgl-render RUNTIME DESTINATION bin)
 # ${PROJECT_SOURCE_DIR} )
 #
 # add_test(NAME mbgl-render-tool-test COMMAND mbgl-render WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} )
+
+if(MLN_WITH_OPENGL)
+    target_compile_definitions(mbgl-render PRIVATE "MLN_RENDER_BACKEND_OPENGL=1")
+endif()