FIX: RL defined in host-lib.c file, in all embedded extensions it must be used as extern

Author: Oldes

src/os/win32/host-lib.c

@@ -67,6 +67,8 @@
 #include "reb-host.h"
 #include "host-lib.h"
 
+RL_LIB *RL; // Link back to reb-lib from embedded extensions (like for now: host-window, host-ext-test..)
+
 // Semaphore lock to sync sub-task launch:
 static void *Task_Ready;
 

src/os/win32/host-window.c

@@ -126,7 +126,7 @@ static REBOOL Windows8_And_Newer = FALSE;
 
 static u32* window_ext_words;
 
-RL_LIB *RL; // Link back to reb-lib from embedded extensions
+extern RL_LIB *RL; // Link back to reb-lib from embedded extensions
 
 //***** Globals *****//