Reviewed-by: ohair, tbell

Summary: Just removing unneeded makefile rules and 'control' logic.
Reviewed-by: xdono

Summary: If OPENJDK has a value, that value must be "true", empty value == undefined with GNU make.
Reviewed-by: tbell

Summary: SKIP_OPENJDK_BUILD now set to true.
Reviewed-by: xdono

Summary: Change build rules to allow for openjdk builds by default when building the closed or production build.
Reviewed-by: xdono