use GCC inline magic

Better fix for #326. ICC happens to support the inline magic

Change-Id: Ic367eea608c88d89475cb7b05d73500d2a1bc42b

vpx_ports/asm_offsets.h

@@ -0,0 +1,31 @@
+/*
+ *  Copyright (c) 2011 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#ifndef VPX_PORTS_ASM_OFFSETS_H
+#define VPX_PORTS_ASM_OFFSETS_H
+
+#include <stddef.h>
+
+#define ct_assert(name,cond) \
+    static void assert_##name(void) UNUSED;\
+    static void assert_##name(void) {switch(0){case 0:case !!(cond):;}}
+
+#if INLINE_ASM
+#define DEFINE(sym, val) asm("\n" #sym " EQU %0" : : "i" (val));
+#define BEGIN int main(void) {
+#define END return 0; }
+#else
+#define DEFINE(sym, val) int sym = val;
+#define BEGIN
+#define END
+#endif
+
+#endif /* VPX_PORTS_ASM_OFFSETS_H */