libotautil: Add missed header

ZipUtil was deprecated at android-8.1 but it has been still used by
zipwrap. So this patch fixes the missed header file at new android version.

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I60bf67292021f3b63fb1ee2b8774303d9300fa12
diff --git a/otautil/Android.mk b/otautil/Android.mk
index f7ca9a9..45e0f76 100644
--- a/otautil/Android.mk
+++ b/otautil/Android.mk
@@ -25,6 +25,12 @@
     libselinux \
     libbase
 
+ifeq ($(shell test $(PLATFORM_SDK_VERSION) -gt 26; echo $$?),0)
+# Android 8.1 header
+LOCAL_C_INCLUDES += \
+    system/core/libziparchive/include
+endif
+
 LOCAL_MODULE := libotautil
 LOCAL_CFLAGS := \
     -Werror \