[committed] libstdc++: Fix preprocessor condition [PR 98344]

[Jonathan Wakely]

libstdc++-v3/ChangeLog:

	PR libstdc++/98344
	* include/bits/semaphore_base.h: Fix preprocessor condition.

Tested powerpc64le-linux. Committed to trunk.

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commit 8dc63f13f03facc49b777195c9068432477b5dcd
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Dec 17 12:09:20 2020

    libstdc++: Fix preprocessor condition [PR 98344]
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/98344
            * include/bits/semaphore_base.h: Fix preprocessor condition.

diff --git a/libstdc++-v3/include/bits/semaphore_base.h b/libstdc++-v3/include/bits/semaphore_base.h
index e4e57de4acf..c796a77f3b1 100644
--- a/libstdc++-v3/include/bits/semaphore_base.h
+++ b/libstdc++-v3/include/bits/semaphore_base.h
@@ -276,7 +276,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 // Note: the _GLIBCXX_REQUIRE_POSIX_SEMAPHORE macro can be used to force the
 // use of Posix semaphores (sem_t). Doing so however, alters the ABI.
-#ifdef _GLIBCXX_HAVE_LINUX_FUTEX && !_GLIBCXX_REQUIRE_POSIX_SEMAPHORE
+#if defined _GLIBCXX_HAVE_LINUX_FUTEX && !_GLIBCXX_REQUIRE_POSIX_SEMAPHORE
   // Use futex if available and didn't force use of POSIX
   using __fast_semaphore = __atomic_semaphore<__detail::__platform_wait_t>;
 #elif _GLIBCXX_HAVE_POSIX_SEMAPHORE