[Java] Use defaults for clang 7.
[Java] Use defaults for clang 7.

mikeb01/Aeron,real-logic/Aeron,real-logic/Aeron,mikeb01/Aeron,galderz/Aeron,real-logic/Aeron,real-logic/Aeron,galderz/Aeron,EvilMcJerkface/Aeron,EvilMcJerkface/Aeron,mikeb01/Aeron,EvilMcJerkface/Aeron,galderz/Aeron,mikeb01/Aeron,galderz/Aeron,EvilMcJerkface/Aeron