Use macros for the likely/unlikely attributes

The syntax parser for GCC 8 (and earlier?) fails when these attributes are in
certain places.

1 files changed, 2 insertions, 2 deletions

diff --git a/al/extension.cpp b/al/extension.cpp
index 3a84ee08..3ead0af8 100644
--- a/al/extension.cpp
+++ b/al/extension.cpp
@@ -37,9 +37,9 @@ AL_API ALboolean AL_APIENTRY alIsExtensionPresent(const ALchar *extName)
 START_API_FUNC
 {
     ContextRef context{GetContextRef()};
-    if(!context) [[unlikely]] return AL_FALSE;
+    if(!context) UNLIKELY return AL_FALSE;
 
-    if(!extName) [[unlikely]]
+    if(!extName) UNLIKELY
     {
         context->setError(AL_INVALID_VALUE, "NULL pointer");
         return AL_FALSE;