#2 Unnecessary rebuilds sqlite from web archive

[Vitali]

Two consecutive calls to MakeSqlite will both rebuild
the src/sqlite source files from the original web
archive, even though in theory the second time nothing
should happen.

[Vitali]

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The only target to be called from MakeSqlite from the main
Makefile is to be something like "build" which compiles the
SQLite sources for use in the project.