add via hack for portaudio

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4038 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_portaudio/pa_ringbuffer.c

@@ -85,6 +85,10 @@
 #      define PaUtil_FullMemoryBarrier()  asm volatile("sync":::"memory")
 #      define PaUtil_ReadMemoryBarrier()  asm volatile("sync":::"memory")
 #      define PaUtil_WriteMemoryBarrier() asm volatile("sync":::"memory")
+#   elif defined(__VIA_HACK__)
+#         define PaUtil_FullMemoryBarrier()
+#         define PaUtil_ReadMemoryBarrier()
+#         define PaUtil_WriteMemoryBarrier()
 #   elif defined( __i386__ ) || defined( __i486__ ) || defined( __i586__ ) || defined( __i686__ ) || defined(__x86_64__)
 #      define PaUtil_FullMemoryBarrier()  asm volatile("mfence":::"memory")
 #      define PaUtil_ReadMemoryBarrier()  asm volatile("lfence":::"memory")