fio assumes <sys/sysmacros.h> has been included.

Bug: https://github.com/android-ndk/ndk/issues/398
Test: builds
Change-Id: I1a6b31173bd91b96a8c13f47599209dd03ec64e9
diff --git a/Android.mk b/Android.mk
index 35a6973..87eb249 100644
--- a/Android.mk
+++ b/Android.mk
@@ -101,6 +101,10 @@
                 -Wno-unused-parameter \
                 -Wno-unused-variable \
 
+# Workaround until upstream copes with a glibc/bionic where <sys/types.h>
+# doesn't get you <sys/sysmacros.h> for free.
+LOCAL_CFLAGS += -include sys/sysmacros.h
+
 LOCAL_LDFLAGS += \
                 -rdynamic \