Per patch from Samuel Thibault, silence warning from Clang

This commit was SVN r32720.

opal/mca/hwloc/hwloc191/hwloc/include/private/cpuid-x86.h

@@ -16,7 +16,7 @@ static __hwloc_inline int hwloc_have_x86_cpuid(void)
 {
   int ret;
   unsigned tmp, tmp2;
-  asm(
+  __asm__(
       "mov $0,%0\n\t"   /* Not supported a priori */
 
       "pushfl   \n\t"   /* Save flags */
@@ -64,7 +64,7 @@ static __hwloc_inline void hwloc_x86_cpuid(unsigned *eax, unsigned *ebx, unsigne
    * use them :/ */
 #ifdef HWLOC_X86_64_ARCH
   hwloc_uint64_t sav_rbx;
-  asm(
+  __asm__(
   "mov %%rbx,%2\n\t"
   "cpuid\n\t"
   "xchg %2,%%rbx\n\t"
@@ -73,7 +73,7 @@ static __hwloc_inline void hwloc_x86_cpuid(unsigned *eax, unsigned *ebx, unsigne
     "+c" (*ecx), "=&d" (*edx));
 #elif defined(HWLOC_X86_32_ARCH)
   unsigned long sav_ebx;
-  asm(
+  __asm__(
   "mov %%ebx,%2\n\t"
   "cpuid\n\t"
   "xchg %2,%%ebx\n\t"