RPM Handling Fix, 1.0.27-patches branch (2020.10.07.)
requested to merge akraszna/atlasexternals:RPMHandlingFix-1.0.27-patches-20201007 into 1.0.27-patches
Taught lcg_need_rpm(...) not to set up an RPM dependency if LCG is not providing the package.
This was necessary to fix the latest issue that showed up in ATLINFR-3741.