Fix compilation error due to new strlcpy function that glibc added

The crash-utility has its own strlcpy(), but recently the latest glibc
has also implemented the strlcpy function, which is derived from
OpenBSD.  Eventually this caused the following compilation error:

  # make -j8 lzo
  ...
  In file included from global_data.c:18:
  defs.h:5556:8: error: conflicting types for ‘strlcpy’; have ‘size_t(char *, char *, size_t)’ {aka ‘long unsigned int(char *, char *, long unsigned int)’}
   5556 | size_t strlcpy(char *, char *, size_t);
        |        ^~~~~~~
  In file included from memory.c:19:
  defs.h:5556:8: error: conflicting types for ‘strlcpy’; have ‘size_t(char *, char *, size_t)’ {aka ‘long unsigned int(char *, char *, long unsigned int)’}
   5556 | size_t strlcpy(char *, char *, size_t);
        |        ^~~~~~~
  ...

To fix the issue, let's declare the strlcpy() as a weak function and
keep the same parameter types as the glibc function has.

Related glibc commits:
454a20c8756c ("Implement strlcpy and strlcat [BZ #178]")
d2fda60e7c40 ("manual: Manual update for strlcat, strlcpy, wcslcat, wclscpy")
388ae538ddcb ("hurd: Add strlcpy, strlcat, wcslcpy, wcslcat to libc.abilist")

Signed-off-by: Lianbo Jiang <lijiang@redhat.com>

defs.h

@@ -5553,7 +5553,7 @@ uint32_t swap32(uint32_t, int);
 uint64_t swap64(uint64_t, int);
 ulong *get_cpumask_buf(void);
 int make_cpumask(char *, ulong *, int, int *);
-size_t strlcpy(char *, char *, size_t);
+size_t strlcpy(char *, const char *, size_t) __attribute__ ((__weak__));
 struct rb_node *rb_first(struct rb_root *);
 struct rb_node *rb_parent(struct rb_node *, struct rb_node *);
 struct rb_node *rb_right(struct rb_node *, struct rb_node *);

tools.c

@@ -6795,7 +6795,7 @@ make_cpumask(char *s, ulong *mask, int flags, int *errptr)
  * always be NULL-terminated.
  */
 size_t 
-strlcpy(char *dest, char *src, size_t size)
+strlcpy(char *dest, const char *src, size_t size)
 {
 	size_t ret = strlen(src);