[committed] libstdc++: Fix typo in comment

[Jonathan Wakely]

libstdc++-v3/ChangeLog:

	* config/os/gnu-linux/os_defines.h: Fix type in comment.

Tested powerpc64le-linux. Committed to trunk.

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commit 19aa9bc9897955817622574e62b53b24ae0837e9
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Apr 22 15:48:29 2021

    libstdc++: Fix typo in comment
    
    libstdc++-v3/ChangeLog:
    
            * config/os/gnu-linux/os_defines.h: Fix type in comment.

diff --git a/libstdc++-v3/config/os/gnu-linux/os_defines.h b/libstdc++-v3/config/os/gnu-linux/os_defines.h
index 64f78df8eef..d5bb2a1886e 100644
--- a/libstdc++-v3/config/os/gnu-linux/os_defines.h
+++ b/libstdc++-v3/config/os/gnu-linux/os_defines.h
@@ -33,7 +33,7 @@
 // System-specific #define, typedefs, corrections, etc, go here.  This
 // file will come before all others.
 
-// This keeps isanum, et al from being propagated as macros.
+// This keeps isalnum, et al from being propagated as macros.
 #define __NO_CTYPE 1
 
 #include <features.h>