Do not perform any dependency checking on building SRPMs.

     Change: no-deps-on-building-srpms
     Purpose: Do not perform any dependency checking on building SRPMs.
     Reason: We never found any reason why this is of any benefit for
                     just rolling a source RPM package.
     Hint: (jbj) There is a benefit if you want digest(...) and/or
                     signature(...) verification of build elements before
                     inclusion in *.src.rpm.
                     (rse) Yes, This is something we really want, OTOH
                     we really do NEVER want to have to install all
                     BuildPreReq _packages_ just to roll a SRPM. OTOH
                     "-bs --nodeps" then also skipps the wished checks.
                     Hmmm... we would need to replace the boolean
                     "noDeps" with DEPS_NONE, DEPS_INTEGRITY and
                     DEPS_ALL. DEPS_NONE is the old "noDeps = 1",
                     DEPS_ALL is the old "noDeps = 1" and DEPS_INTEGRITY
                     is new and would lead to the checking of only
                     those BuildRequires/BuildPreReqs which ensure the
                     integrity of the rolled SRPMS (currently AFAIK
                     "digest(...)", "signature(...)", "gnupg(...)", etc)
                     and especially skip the dependencies to installed
                     packages. Or even better: make DEPS_XXX bits of a
                     bitmask and allow one to assemble what one really
                     wished to be checked.