8173308: JAVAC_OPTIONS should be updated to align with JAVA_OPTIONS
Reviewed-by: jjg

8136930: Simplify use of module-system options by custom launchers
8160489: Multiple -Xpatch lines ignored by javac
8156998: javac should support new option -XinheritRuntimeEnvironment
Reviewed-by: jlahoda, ksrini

8156962: javac should support options specified in _JAVAC_OPTIONS
Reviewed-by: vromero