Restore capabilities to run-as binary

Change-Id: I9e2b8e9b69c94b94c57143c04b950530490ec33e
diff --git a/Android.mk b/Android.mk
index c6c7f3c..013e4e1 100644
--- a/Android.mk
+++ b/Android.mk
@@ -272,6 +272,9 @@
 else ifeq ($(TARGET_RECOVERY_QCOM_RTC_FIX),true)
     LOCAL_CFLAGS += -DQCOM_RTC_FIX
 endif
+ifneq ($(wildcard bionic/libc/include/sys/capability.h),)
+    LOCAL_CFLAGS += -DHAVE_CAPABILITIES
+endif
 
 include $(BUILD_EXECUTABLE)