provide out-of-line strcat() for m68k

Whether we sidestep it in init/main.c or not, such situations
will arise again; compiler does generate calls of strcat()
on optimizations, so we really ought to have an out-of-line
version...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/m68k/lib/string.c

@@ -15,6 +15,12 @@ char *strcpy(char *dest, const char *src)
 }
 EXPORT_SYMBOL(strcpy);
 
+char *strcat(char *dest, const char *src)
+{
+	return __kernel_strcpy(dest + __kernel_strlen(dest), src);
+}
+EXPORT_SYMBOL(strcat);
+
 void *memset(void *s, int c, size_t count)
 {
 	void *xs = s;