only use __x86_64__, not __amd64__ (bug 15503)

src/mesa/drivers/dri/sis/sis_context.h

@@ -401,7 +401,7 @@ struct sis_context
 #define MMIO_READ(reg) *(volatile GLint *)(smesa->IOBase + (reg))
 #define MMIO_READf(reg) *(volatile GLfloat *)(smesa->IOBase + (reg))
 
-#if defined(__i386__) || defined(__amd64__)
+#if defined(__i386__) || defined(__x86_64__)
 #define MMIO_WMB()	__asm __volatile("" : : : "memory")
 #elif defined(__ia64__)
 #define MMIO_WMB()	__asm __volatile("mf" : : : "memory")

src/mesa/main/imports.h

@@ -159,7 +159,7 @@ typedef union { GLfloat f; GLint i; } fi_type;
  ***/
 #if defined(__i386__) || defined(__386__) || defined(__sparc__) || \
     defined(__s390x__) || defined(__powerpc__) || \
-    defined(__amd64__) || defined(__x86_64__) || \
+    defined(__x86_64__) || \
     defined(ia64) || defined(__ia64__) || \
     defined(__hppa__) || defined(hpux) || \
     defined(__mips) || defined(_MIPS_ARCH) || \

src/mesa/math/m_debug_util.h

@@ -185,7 +185,7 @@ extern char *mesa_profile;
 
 #endif
 
-#elif defined(__amd64__)
+#elif defined(__x86_64__)
 
 #define rdtscll(val) do { \
      unsigned int a,d; \