Fix build warnings

- switch from strncpy to memcpy for -Wstringop-truncation

Author: remicollet

ext/phar/tar.c

@@ -772,9 +772,9 @@ static int phar_tar_writeheaders_int(phar_entry_info *entry, void *argument) /*
 		}
 	}
 
-	strncpy(header.magic, "ustar", sizeof("ustar")-1);
-	strncpy(header.version, "00", sizeof("00")-1);
-	strncpy(header.checksum, "        ", sizeof("        ")-1);
+	memcpy(header.magic, "ustar", sizeof("ustar")-1);
+	memcpy(header.version, "00", sizeof("00")-1);
+	memcpy(header.checksum, "        ", sizeof("        ")-1);
 	entry->crc32 = phar_tar_checksum((char *)&header, sizeof(header));
 
 	if (FAILURE == phar_tar_octal(header.checksum, entry->crc32, sizeof(header.checksum)-1)) {

ext/phar/zip.c

@@ -821,8 +821,8 @@ static int phar_zip_changed_apply_int(phar_entry_info *entry, void *arg) /* {{{
 	memset(&local, 0, sizeof(local));
 	memset(&central, 0, sizeof(central));
 	memset(&perms, 0, sizeof(perms));
-	strncpy(local.signature, "PK\3\4", 4);
-	strncpy(central.signature, "PK\1\2", 4);
+	memcpy(local.signature, "PK\3\4", 4);
+	memcpy(central.signature, "PK\1\2", 4);
 	PHAR_SET_16(central.extra_len, sizeof(perms));
 	PHAR_SET_16(local.extra_len, sizeof(perms));
 	perms.tag[0] = 'n';
@@ -1409,7 +1409,7 @@ int phar_zip_flush(phar_archive_data *phar, char *user_stub, zend_long len, int
 	pass.free_fp = pass.free_ufp = 1;
 	memset(&eocd, 0, sizeof(eocd));
 
-	strncpy(eocd.signature, "PK\5\6", 4);
+	memcpy(eocd.signature, "PK\5\6", 4);
 	if (!phar->is_data && !phar->sig_flags) {
 		phar->sig_flags = PHAR_SIG_SHA1;
 	}

ext/standard/crypt.c

@@ -255,7 +255,7 @@ PHP_FUNCTION(crypt)
 
 	/* The automatic salt generation covers standard DES, md5-crypt and Blowfish (simple) */
 	if (!*salt) {
-		strncpy(salt, "$1$", 3);
+		memcpy(salt, "$1$", 3);
 		php_random_bytes_throw(&salt[3], 8);
 		php_to64(&salt[3], 8);
 		strncpy(&salt[11], "$", PHP_MAX_SALT_LEN - 11);