warnings in 'filenamecat' module

[Bruno Haible]

The 'filenamecat' module has warnings on Linux/glibc:

gcc -DHAVE_CONFIG_H -I. -I/packages/megatestdir/filenamecat/lib -I..     -g -O2 
-c /packages/megatestdir/filenamecat/lib/filenamecat.c
/packages/megatestdir/filenamecat/lib/filenamecat.c: In function 
`file_name_concat':
/packages/megatestdir/filenamecat/lib/filenamecat.c:78: warning: assignment 
makes pointer from integer without a cast
/packages/megatestdir/filenamecat/lib/filenamecat.c:85: warning: assignment 
makes pointer from integer without a cast

IMO modules/filenamecat should depend on 'mempcpy', and
lib/filenamecat.c should #include "mempcpy.h".

Bruno