Disable macro redefined warnings.

The new kernel headers do:

  #define __bitwise __bitwise__

However, the code redefines __bitwise without undef'ing it first.

This is a temporary fix, b/35721782 filed to fix this.

Change-Id: Idd8d00737a369fbad89c35ca6a647f33d5ace3ae
Test: Builds without warningers/errors.
diff --git a/wpa_supplicant/Android.mk b/wpa_supplicant/Android.mk
index 71e08e7..3f42fe4 100644
--- a/wpa_supplicant/Android.mk
+++ b/wpa_supplicant/Android.mk
@@ -25,6 +25,9 @@
 # Disable unused parameter warnings
 L_CFLAGS += -Wno-unused-parameter
 
+# Disable redefined macro warnings
+L_CFLAGS += -Wno-macro-redefined
+
 # Set Android extended P2P functionality
 L_CFLAGS += -DANDROID_P2P