bug#4992: Invalid use of strcpy() in etags

[Jan Djärv]

Tobias Ringström skrev:
> The function absolute_filename() lib-src/etags.c has two invalid calls 
> to strcpy() with overlapping arguments. It's undefined C that often 
> happens to work, but breaks very badly for at least gcc 4.4.2 and glibc 
> 2.11 on x86_64, which is default for Fedora 12.
>
> The attached patch replaces the bogus strcpy() calls with calls to 
> memmove().

Checked in, thanks.

        Jan D.