Prevent include of luajit_rolling.h.

Thanks to Peter Cawley. #1145

src/host/genversion.lua

@@ -29,7 +29,7 @@ local function file_write_mod(file, data)
   assert(fp:close())
 end
 
-local text = file_read(FILE_ROLLING_H)
+local text = file_read(FILE_ROLLING_H):gsub("#error.-\n", "")
 local relver = file_read(FILE_RELVER_TXT):match("(%d+)")
 
 if relver then

src/luajit_rolling.h

@@ -67,4 +67,5 @@ LUA_API int luaJIT_setmode(lua_State *L, int idx, int mode);
 /* Enforce (dynamic) linker error for version mismatches. Call from main. */
 LUA_API void LUAJIT_VERSION_SYM(void);
 
+#error "DO NOT USE luajit_rolling.h -- only include build-generated luajit.h"
 #endif