Fix [-Wundef] warning in ZIP extension

Author: Girgias

ext/zip/php_zip.c

@@ -3323,7 +3323,7 @@ static PHP_MINIT_FUNCTION(zip)
 #endif
 	REGISTER_ZIP_CLASS_CONST_LONG("EM_UNKNOWN",				ZIP_EM_UNKNOWN);
 
-#if HAVE_LIBZIP_VERSION
+#ifdef HAVE_LIBZIP_VERSION
 	zend_declare_class_constant_string(zip_class_entry, "LIBZIP_VERSION", sizeof("LIBZIP_VERSION")-1, zip_libzip_version());
 #else
 	zend_declare_class_constant_string(zip_class_entry, "LIBZIP_VERSION", sizeof("LIBZIP_VERSION")-1, LIBZIP_VERSION);
@@ -3356,7 +3356,7 @@ static PHP_MINFO_FUNCTION(zip)
 
 	php_info_print_table_row(2, "Zip", "enabled");
 	php_info_print_table_row(2, "Zip version", PHP_ZIP_VERSION);
-#if HAVE_LIBZIP_VERSION
+#ifdef HAVE_LIBZIP_VERSION
 	php_info_print_table_row(2, "Libzip headers version", LIBZIP_VERSION);
 	php_info_print_table_row(2, "Libzip library version", zip_libzip_version());
 #else

ext/zip/zip_stream.c

@@ -18,7 +18,7 @@
 #   include "config.h"
 #endif
 #include "php.h"
-#if HAVE_ZIP
+#ifdef HAVE_ZIP
 
 #include "php_streams.h"
 #include "ext/standard/file.h"