Follow-up fix for iOS build.

src/Makefile

@@ -362,7 +362,7 @@ ifneq ($(HOST_SYS),$(TARGET_SYS))
     HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_OSX
   else
   ifeq (iOS,$(TARGET_SYS))
-    HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_OSX
+    HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_OSX -DTARGET_OS_IPHONE=1
   else
     HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_OTHER
   endif