[BUG] resolve() function fails to resolve path ending with path separator

[ZyX]

Consider the following script:

    mkdir a
    ln -s a b
    vim -u NONE -c 'call writefile([resolve("./b"),resolve("./b/")], "t.out")' \
                -c 'qa!'

Expected output: two lines containing «./a» and «./a/» in t.out file (according 
to the help, resolve() keeps trailing path separator).
Real output: lines «./a» and «./b/» in t.out.

Tested on vim-7.3.102 from Gentoo repos and vim-7.3.119 (mercurial revision 
77f3dd990b12).

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