Remove superfluous OpenSSL include paths.

This include path was needed because system/vold/cryptfs.h included an
OpenSSL header just to get the length of a SHA-256 hash. This has been
fixed in https://android-review.googlesource.com/#/c/124477/1.

Change-Id: I06a8ba0ee5b9efcc3260598f07d9819f065711de
diff --git a/Android.mk b/Android.mk
index 1a91f00..45aa22d 100644
--- a/Android.mk
+++ b/Android.mk
@@ -92,7 +92,6 @@
 endif
 
 LOCAL_C_INCLUDES += system/extras/ext4_utils
-LOCAL_C_INCLUDES += external/openssl/include
 
 include $(BUILD_EXECUTABLE)