Update meson.build

Author: dreamer-coding

meson.build

@@ -2,6 +2,6 @@ project('Fossil IO', 'c', 'cpp',
     meson_version: '>=1.3.0',
     license: 'MPL-2.0',
     version: '0.1.0',
-    default_options: ['c_std=c18', 'cpp_std=c++20'])
+    default_options: ['c_std=c17,c18', 'cpp_std=c++20'])
 
 subdir('code')