.cvsignore -> .gitignore

We no longer use CVS, so let's teach Git about what files to ignore...

... though doing `git status` after make + `make test` still gives
untracked content:

    # Untracked files:
    #   (use "git add <file>..." to include in what will be committed)
    #
    #       alloca86-bt.o
    #       alloca86.o
    #       bcheck.o
    #       libtcc.a
    #       libtcc.o
    #       libtcc1.a
    #       libtcc1.o
    #       tcc.o

See next patch about this stuff.

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