[OS/2] Bug 433220: fix Thunderbird build break on OS/2, r=mkaply

modules/plugin/Makefile.in

@@ -69,7 +69,10 @@ TOOL_DIRS += samples/default/windows
 endif
 
 ifeq ($(OS_ARCH),OS2)
-TOOL_DIRS += samples/default/os2 os2wrapper
+TOOL_DIRS += samples/default/os2
+ifdef MOZ_OJI
+TOOL_DIRS += os2wrapper
+endif
 ifdef ENABLE_TESTS
 TOOL_DIRS += tools/tester/common tools/tester/os2
 endif