Use default Java language version for the Create module

Building with IntelliJ should use the same Java language version for
Create than for the rest of the layoutlib project. That makes the build
from IntelliJ identical to the build from the Android build system.

Bug: N/A
Test: layoutlib create tests
Change-Id: I8c537ba4860bf7e95e0ff1493101fdc1883899c4
1 file changed