ralloc: don't leave out the alignment factor

Experimentation shows that without alignment factor gcc and clang choose
a factor of 16 even on IA-32, which doesn't match what malloc() uses (8).
The problem is it makes gcc assume the pointer is 16 byte aligned, so
with -O3 it starts using aligned SSE instructions that later fault,
so always specify a suitable alignment factor.

Cc: Jonas Pfeil <pfeiljonas@gmx.de>
Fixes: cd2b55e5 "ralloc: Make sure ralloc() allocations match malloc()'s alignment."
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100049
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Tested by: Mike Lothian <mike@fireburn.co.uk>
Tested by: Jonas Pfeil <pfeiljonas@gmx.de>

src/util/ralloc.c

@@ -59,8 +59,10 @@ _CRTIMP int _vscprintf(const char *format, va_list argptr);
 struct
 #ifdef _MSC_VER
  __declspec(align(8))
+#elif defined(__LP64__)
+ __attribute__((aligned(16)))
 #else
- __attribute__((aligned))
+ __attribute__((aligned(8)))
 #endif
    ralloc_header
 {