Fix issue 4884, preventing a crash in the socket code when python is compiled
with llvm-gcc and run with a glibc <2.10.
diff --git a/Include/pyport.h b/Include/pyport.h
index 15c8644..54411f2 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -709,6 +709,15 @@
#define Py_FORMAT_PARSETUPLE(func,p1,p2)
#endif
+/*
+ * Specify alignment on compilers that support it.
+ */
+#if defined(__GNUC__) && __GNUC__ >= 3
+#define Py_ALIGNED(x) __attribute__((aligned(x)))
+#else
+#define Py_ALIGNED(x)
+#endif
+
/* Eliminate end-of-loop code not reached warnings from SunPro C
* when using do{...}while(0) macros
*/