autconf bcopy and bzero

[Dan Nicolaescu]

uclibc uses #define to define bcopy and bzero in <strings.h>
emacs' configure script decides that bcopy and bzero are not available
and then #defines them in config.h. 

Then all the files get warnings like this:

In file included from frame.c:22:
./config.h:1159:1: warning: "bcopy" redefined
In file included from ./config.h:1096,
                 from frame.c:22:
/usr/include/string.h:329:1: warning: this is the location of the
previous definition
In file included from frame.c:22:
./config.h:1162:1: warning: "bzero" redefined
In file included from ./config.h:1096,
                 from frame.c:22:
/usr/include/string.h:330:1: warning: this is the location of the
previous definition

Can somebody that understands the autoconf magic involved please fix
this? Thanks.