feat(gx): add incomplete 'CGxDeviceGLSDL' (#2)

* chore(build): add vendored SDL 3.0.0 library

* chore(build): add vendored glew-cmake-2.2.0 library

* feat(console): in the presence of -opengl launch flag, change GxApi to OpenGl

* feat(gx): add uncompleted CGxDeviceGLSDL targeting Windows and Linux

* chore(build): change SDL3 linkage from shared (bad) to to static (good)

vendor/sdl-3.0.0/build-scripts/strip_fPIC.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# libtool assumes that the compiler can handle the -fPIC flag
+# This isn't always true (for example, nasm can't handle it)
+command=""
+while [ $# -gt 0 ]; do
+    case "$1" in
+        -?PIC)
+            # Ignore -fPIC and -DPIC options
+            ;;
+        -fno-common)
+            # Ignore -fPIC and -DPIC options
+            ;;
+        *)
+            command="$command $1"
+            ;;
+    esac
+    shift
+done
+echo $command
+exec $command