[12] RFR(XXS) 8208635: Minimal VM build is broken after JDK-8199868 (Support JNI critical functions in object pinning API)

[Zhengyu Gu]

Could you please review this trivial fix that adds a missing header file 
for minimal VM build?

Bug: https://bugs.openjdk.java.net/browse/JDK-8208635
Webrev: http://cr.openjdk.java.net/~zgu/8208635/webrev.00/

Test:
   minimal VM build on Linux x86_64 (fastdebug and release)


Thanks,

-Zhengyu