Add PLATFORM_VERSION to VERSION_STR_POSTFIX definition

Change-Id: I26e4223c58ca941088cc319847da3c7c9d7fef95
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/wpa_supplicant/Android.mk b/wpa_supplicant/Android.mk
index e246e80..14d2ccd 100644
--- a/wpa_supplicant/Android.mk
+++ b/wpa_supplicant/Android.mk
@@ -31,6 +31,8 @@
 # To ignore possible wrong network configurations
 L_CFLAGS = -DWPA_IGNORE_CONFIG_ERRORS
 
+L_CFLAGS += -DVERSION_STR_POSTFIX=\"-$(PLATFORM_VERSION)\"
+
 # Set Android log name
 L_CFLAGS += -DANDROID_LOG_NAME=\"wpa_supplicant\"