Added missing libsw library

external/libsdf/libsw/memmove.c

@@ -0,0 +1,41 @@
+#include <stddef.h>
+
+void 
+*memmove(void *s1, const void *s2, size_t n)
+{
+#if 0 /* Assume the caller knew this when he decided to use memmove */
+    if ((char *)s1 >= (char *)s2 + n || (char *)s1 + n <= (char *)s2){
+	return memcpy(s1, s2, n);
+    }
+#endif
+    if(((unsigned long)s1)%sizeof(int)==0 && 
+       ((unsigned long)s2)%sizeof(int)==0 && 
+       n%sizeof(int)==0){
+	/* Everything is alligned.  We can use int assignment. */
+	int *ip1 = s1;
+	const int *ip2 = s2;
+	n /= sizeof(int);
+	if( ip1 < ip2 ){
+	    while(n--)
+		*ip1++ = *ip2++;
+	}else{
+	    ip2 += n;
+	    ip1 += n;
+	    while(n--)
+		*--ip1 = *--ip2;
+	}
+    }else{
+	char *cp1 = s1;
+	const char *cp2 = s2;
+	if(cp1 < cp2) {
+	    while(n--)
+		*cp1++ = *cp2++;
+	}else{
+	    cp2 += n;
+	    cp1 += n;
+	    while(n--)
+		*--cp1 = *--cp2;
+	}
+    }
+    return s1;
+}