[Uim] HEADSUP: New directory 'replace' is created and put foreign souces into it.

[Masahito Omote]

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Since last commit r1506, sources in uim directory which come from outside of
uim are put into 'replace' directory. These sources are existing for the
specific OSes that does not support certain functions such as setenv(),
unsetenv(), getpeereid() and etc...

The purpose of this commit is to make it clear the origin of the sources and
the resposiblity of sources - whether the source is created by uim originally
or got from outside of uim such as NetBSD.

I believe this commit does not harm, i.e. not break libuim's ABI, because
only file locations and linking process are changed and because the uim's APIs
are not changed at all. But the comilation errors can happen because I do not
have commercial OSes such as Solaris. If so, please let us know.

Dear committers: If serious problems are found, please revert this commit.

Thanks,
- -- 
Masahito Omote(omote at utyuuzin.net, omote at sapmed.ac.jp, omote at debian.org)
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