gh-91731: Add macro compatibility for static_assert for old libcs (GH-92559)

Author: pablogsal

Include/pymacro.h

@@ -10,6 +10,14 @@
 #  define static_assert _Static_assert
 #endif
 
+// static_assert is defined in GLIB from version 2.16. Before it requires
+// compiler support (gcc >= 4.6) and is called _Static_assert.
+#if (defined(__GLIBC__) \
+     && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 16)) \
+     && !defined(static_assert))
+#  define static_assert _Static_assert
+#endif
+
 /* Minimum value between x and y */
 #define Py_MIN(x, y) (((x) > (y)) ? (y) : (x))