Fix game crashing on NetworkingInit on Windows. Also add a 32-bit Windows build.

Also stubbed out InitSingleplayer in menu.cpp cuz this client doesn't want to work with servers correctly.

src/helpers/mesher.cpp

@@ -9,6 +9,7 @@
 
 #ifndef SERVER
 #ifndef LEGACY_GL
+
 MeshData GenerateChunkMesh(ChunkRenderData chunkRenderData, Chunk chunk, int chunkWorldX, int chunkWorldY, uint8_t sideMask)
 {
     MeshData out = {0};