Summary: By default if OPENJDK=true is set then we don't look in the alt-src predefined location. The user can explicitly set HS_ALT_SRC_REL to the desired location in conjunction with OPENJDK=true, if they wish.
Reviewed-by: jcoomes, kamg

Summary: Add support for distribution-specific error reporting
Reviewed-by: coleenp, phh, jcoomes, ohair