Ignore generated OCK provider JNI headers (#1455)

Update the `.gitignore` file to ignore new generated headers in ock
directory.

Signed-off-by: Jason Katonica <katonica@us.ibm.com>

Author: jasonkatonica

.gitignore

@@ -40,6 +40,7 @@
 # Dynamically generated header files produced by the build
 /src/main/native/ock/closed_Utils_c.h
 /src/main/native/ock/com_ibm_crypto_plus_provider_base_*.h
+/src/main/native/ock/com_ibm_crypto_plus_provider_ock_*.h
 
 # Files generated by tests.
 /0Test*.txt