SERVER-13522 Consolidate serverOnlyFiles list in scons and cleanup dependencies

The serverOnlyFiles variable was scattered all across the main SConscript
file unniecessarily, so this merges them in one spot (no functional
changes).

Also cleaned up some dependencies, which were unnecessary.
BUILD-365: Create Windows Enterprise Zip File with vcredist and dependent dlls
SERVER-15096 make mongoshim --dbpath option mandatory