windows build fixes

src/rendermode-cave.c

@@ -279,7 +279,7 @@ rendermode_cave_draw(void *data, RenderState *state, PyObject *src, PyObject *ma
 
 }
 
-static RenderModeOption rendermode_cave_options[] = {
+const RenderModeOption rendermode_cave_options[] = {
     {"depth_tinting", "tint caves based on how deep they are (default: True)"},
     {"only_lit", "only render lit caves (default: False)"},
     {"lighting", "render caves with lighting enabled (default: False)"},

src/rendermode-lighting.c

@@ -254,7 +254,7 @@ rendermode_lighting_draw(void *data, RenderState *state, PyObject *src, PyObject
     }
 }
 
-RenderModeOption rendermode_lighting_options[] = {
+const RenderModeOption rendermode_lighting_options[] = {
     {"shade_strength", "how dark to make the shadows, from 0.0 to 1.0 (default: 1.0)"},
     {NULL, NULL}
 };

src/rendermode-normal.c

@@ -284,7 +284,7 @@ rendermode_normal_draw(void *data, RenderState *state, PyObject *src, PyObject *
     }
 }
 
-static RenderModeOption rendermode_normal_options[] = {
+const RenderModeOption rendermode_normal_options[] = {
     {"edge_opacity", "darkness of the edge lines, from 0.0 to 1.0 (default: 0.15)"},
     {"min_depth", "lowest level of blocks to render (default: 0)"},
     {"max_depth", "highest level of blocks to render (default: 127)"},